We decided to give fans a list of the Titans of the Monsterverse (the biggest and most dangerous creatures), this is not meant to give every detail, at least not just yet, since we have vague details on many of them. But it will be expanded as we learn more, and with other creatures as well, and hopefully be a reference to fans, thanks.

​Godzilla
An alpha predator from the Permian period (millions of years before the rise of the dinosaurs in the Mesozoic era), Godzilla awakened to feed on American and Soviet nuclear submarines decades before the events of 2014’s Godzilla. After defeating the M.U.T.Os in that movie, Godzilla retreated from the ruins of San Francisco back into the ocean. In King of the Monsters he returns to take on Ghidorah.
While retaining the same basic design as his 2014 appearance, Godzilla received a slight revamp for King of the Monsters, with his dorsal plates changing in shape. Rather than being jagged and straighter in design, the new design features more protrusions. The three large central dorsal plates running from mid-way down his back are the same shape as the original Godzilla's dorsal plates. The claws of his toes are also longer and curved. His skin is rougher in texture. The tip of his tail is also more rounded. In addition, his eye color also changes when he uses his atomic breath, becoming a bright blue, much like his attack.

​Mothra
Queen of the monsters, Mothra is birthed in larval form early in Godzilla: King of the Monsters, but is soon revealed in all her winged, bioluminescent glory.
Mothra’s larval state is much more insectoid in appearance compared to other incarnations and has a bluish-green coloration to it as opposed to the traditional brown and baby blue eyes.
Her imago state possesses large wings with red, orange, yellow, and black coloration which give off a blue/orange glow with eye patterns akin to her Showa era, Heisei era, and Godzilla: Tokyo S.O.S. designs. She also possesses raptorial front and mid-legs and toed hind-legs akin to the male MUTO. 
Her wings are much narrower than most incarnations. She sports a stockier head than most other interpretations but retains the classic blue eyes. Her abdomen is shaped like a wasp's, much like her 2001 portrayal. Her body still retains her classic white fur though her mouth is vertical as opposed to the usual horizontal position. 

​Rodan
Rodan's original name, 'Radon', is based on 'Pteranodon'. The spelling of Radon in Japanese also corresponds to the name of Ladon, the dragon-like monster represented in Greek Mythology.
This incarnation of Rodan has a larger wingspan compared to any of his interpretations, with a fiery glow coating the bottom edge. His physique and general appearance bear a strong resemblance to a bird of prey, with dark-red skin, a v-split crest with the ends curling inward. He lacks teeth, much like the Showa and Millenium incarnations, though his beak has a serrated look to it, giving the illusion of teeth. He retains the spade-shaped tail from his 1956, Showa, and 2004 incarnations. His eyes are yellow and rather cat-like.  He still retains spikes on his chest, though, compared to other incarnations, they are smaller and less defined. 

​King Ghidorah
Originally dubbed Monster Zero, King Ghidorah is the ultimate nemesis to Godzilla, and mankind, in King of the Monsters. Unlike the other Titans, Ghidorah’s origins may be off-world, similar to his extraterrestrial roots in the Toho Godzilla movies.
Ghidorah's name is likely based on Zmey Gorynych from the 1956 Soviet film Ilya Muromets, the inspiration source of the monster and was called King Dragon in Japan.
"Ghidorah" is likely based on a direct translation of the pronunciation of Hydra in the Russian language.
Like most of his past incarnations, Ghidorah is larger than Godzilla, and each of his neck has a row of spines going down but the middle neck has two rows of spines while the left and right necks have one. The middle head's horns are notably straighter and longer than those of its peripheral heads. Ghidorah's wings are also much larger and more bat-like in appearance than most incarnations, and they can also act as forelimbs to support his massive body. Each of his heads has a crown of horns similar to the Heisei incarnation, but each horn is longer and more curved. The horns also tend to flare depending on Ghidorah's current mood. Ghidorah still has his traditional twin tails with spiked bludgeons at their tips that can rattle as an intimidation display. His legs are digitigrade with avian-like feet, similar to the 2001 incarnation. Ghidorah's eyes are fiery red which seem to glow yellow whenever he charges up and fires his gravity beams, and his tongues are forked, similar to a snake's.

MUTO
(New eight-legged MUTO, Eight-legged female MUTO (Godzilla 2014), Winged male MUTO
Godzilla fought a male and female couple of M.U.T.Os, or “Massive Unidentified Terrestrial Organisms,” in the 2014 Godzilla, footage from which is seen in Godzilla: King of the Monsters. A third M.U.T.O (another female, the larger of the species) pops up in King of the Monsters, awakened by Ghidorah, it looks slightly different in appearance to the previous MUTO, the other female MUTO. This MUTO has three fin-like structures running down her back, as well as leg joints that all end in a noticeable point. Unlike her deceased kin, her exoskeleton is more of a gray color instead of black. It is possible that she is another species of MUTO not yet seen before.
MUTO Prime
The MUTO Prime is nearly identical in appearance to a regular female MUTO, except for several notable differences. The MUTO Prime has a hardened outer shell with razor sharp back spires on it, large orange-glowing forelimbs, as well as several smaller pairs of forelimbs on her chest.

Dagon​
Dagon is seemingly named after the Canaanite fertility and agricultural god commonly thought to be an ocean god thanks to being featured in H.P. Lovecraft's works.
Being apart of the same species, Dagon had many of the traits of Godzilla himself. This includes jagged dorsal plates, dark coarse skin, yellow eyes, gills, wide feet, a robust head, and short forearms.
Dagon encountered and fought with the parasitic MUTO Prime. After a brief fight, Dagon was beaten to the brink of death by MUTO Prime, who then proceeded to implant her eggs into Dagon's stomach lining. The eggs would go on to feed off of Dagon's nuclear-rich blood while he still lived, which eventually killed him. It is his skeleton seen in Godzilla 2014 in the Philippine mine.

​Margygr
Margygr is an aquatic scaly reptilian Titan (similarly to Godzilla), about the size of a whale. She has a flat face with her nostrils above her human-like eyes, like some aquatic mammals, and her skull protrudes backwards, shielding her neck.
In death, Margygr appears burnt, with her skeleton showing, and a jagged rift runs from her neck to her abdomen.

Shinomura
Shinomura are massive, winged, dragon-like monsters with blue scales and black wings. They also resemble scorpions and have multiple eyes.
Shinomura's gigantic super-colony cells are black and blue and resemble starfish.
Shinomura was originally assigned the placeholder name "MUTO" by Monarch, but is later named "Shinomura" by Ishiro Serizawa's father. Shinomura's name is derived from the Japanese term "shi no mure," (死の群れ) literally meaning "swarm of death."
Shinomura is a superorganism composed of countless smaller organisms which join together into a single body. Due to this structure, Shinomura can split apart into multiple bodies and recombine later. It can also change its shape to form spiked tentacles which it uses to capture prey or attack Godzilla.

Kong
Honoring the original design, Industrial Light & Magic developed the 2017 design by giving Kong orange-brown fur, a small crown, a huge brow, an exaggerated muzzle, and animators gave Kong a wide-eyed roar. This Kong was designed to be 104 ft. tall was to give him weight and a grandiose quality that would evoke the idea of a human speck in the shadow of the colossus.
Another big part of the design was instilling a sense of divisiveness in the audience, where some see Kong as a threat, others a savior, and some a God.

Skullcrawlers
Skullcrawlers are large reptilian creatures with only two long forelimbs and no hindlimbs, as well as long, prehensile, serpentine tails. They have long and slender, yet muscular, sturdy bodies. Several aspects of their appearance are noticeably skeletal, particularly their torsos and their heads. What appear to be the "eye sockets" of their skull-like heads are merely empty fenestrae presumably it evolved that way in order to protect its eyes from enemies: their real eyes are set much further back, with the fenestrae perhaps serving to distract enemies from their more vulnerable eyes and acting as heat-seeking sensory pits. The colors of their scales range from dark brown to dark green to a bone white color.
Their heads closely resemble those of Mosasaurs such as Tylosaurus, and their jaws possess two rows of serrated, razor-sharp teeth. The Skullcrawlers have four digits in total of each hand, with the thumb being the smallest digit and the rest of the digits being larger and of the same size, and the adults have a prominent bony spike protrudes out of each of their elbows. The thorny, toothlike structures of their inner mouths somewhat resemble that of a leatherback turtle's. Additionally, they have long, prehensile triple-forked tongues that they can use to grab their prey.

Sker Buffalo
​Sker Buffaloes greatly resemble abnormally large water buffaloes but with several differences. They possess incredibly large horns that have forked into at least three branches. The Sker Buffaloes also have algae covering much of their bodies, probably due to their habit of being submerged underwater. Their backs possess a large amount of foliage, allowing for proper camouflage.

Mire Squid
The Mire Squid seemingly gets its name from its environment, as "Mire" refers to a stretch of swampy or boggy ground, the same areas they tend to inhabit.
Mire Squids resemble a colossal cross between squids and octopus with a head resembling a octopus and eight long arms.
Mire Squids are ambush predators that lurk in the waters of Skull Island for unsuspecting prey.

Spore Mantis
Spore Mantises resemble a stick-insect, albeit one so big it instead mimics a fallen log. They have six wood-shaped legs and bark-like skin covering their bodies, and their head is small and retractable into the log-like covering.

Mother Longlegs
Mother Longlegs are gigantic spider-like creatures that stand around 5 to 7 meters tall. They possess incredibly long legs that resemble bamboo stalks, allowing them to blend in seamlessly with the surrounding forests, with their legs posing as plants and their upper bodies held high above the canopy.
The top half of the Mother Longlegs are covered in leafs with 8 red eyes. In addition to their eight legs, Mother Longlegs possess two additional limbs located closer to their heads, which are equipped with pincer-like claws.
A giant Mother Longlegs is also seen in Issue #4 of Skull Island: The Birth of Kong. It is far larger than the average Mother Longlegs, and can even compete in size to creatures such as the Mire Squids, Skullcrawlers, and Kong himself. Its head is more rigid, and unlike its smaller counterparts, it has fur instead of leaves growing out of the top of its head and abdomen.

Methuselah
Methuselah is named after the biblical figure of the same name (מְתוּשֶׁלַח Məṯûšelaḥ or מְתוּשָׁלַח Məṯûšālaḥ), who is associated with longevity due to the Bible claiming that he lived to be 969 years old.
Very little is seen of Methuselah onscreen. The creature appears to be quadrupedal, with a mammalian face possessing horns like a bull's. His eyes lack visible pupils and are glossy and clouded-over. Methuselah's most noticeable physical trait is the gigantic mountain he carries on his back.
Methuselah was discovered by Monarch near Munich, Germany, and Outpost 67 was constructed around him. Other details about the creature's origins are unclear.

Scylla
Scylla is named after the sea monster of the same name (Σκύλλα Skylla) from Greek mythology.
Scylla is a black giant arachnid-like Titan, with six very long, bony, and lightly haired legs, each with two joints and ending with a claw. These legs are strong enough to tear through solid rock, and small spikes grow out of the first joint. Scylla's head is also surrounded by several squid-like tentacles, and unlike most spiders, she only has two eyes. Her anatomy is that of a squid and not of a spider, allowing her to survive and thrive underwater.
Scylla was discovered by Monarch in the Arizona desert, and Outpost 55 was constructed around her. Other details about the creature's origins are unclear.

Behemoth
Behemoth is named after a beast mentioned in the Bible (בהמות Behemot), which is interpreted often as either referring to a mythical creature or a large animal such as an elephant or rhinoceros.
Behemoth is a mammalian creature resembling a gigantic sloth. He knuckle-walks like an ape using his long and muscular forelimbs which are larger than his hind legs. Behemoth's most notable trait are his colossal mammoth-like tusks which jut downward from his cheeks. Behemoth is covered in light brown fur, and appears to have greenish vines or algae growing on his otherwise gray tusks. Behemoth possesses a row of bumpy triangular spikes running along his back. Behemoth is very tall and appears to nearly match Godzilla himself in physical stature.
Behemoth was discovered by Monarch in Brazil, and an outpost was constructed around him. Other details about the creature's origins are unclear.

Baphomet
Baphomet was a goat-headed demonic entity worshiped by a cult and associated with the Knights Templar. It is unknown if Titanus Baphomet was this worshiped entity or if it is merely named after Baphomet for another reason. (Not seen)

Typhon
Typhon may be referring to Typhon, a monstrous and powerful male serpentine giant in Greek mythology and the father of Scylla. (Not seen)

Abaddon
"Abaddon" is a Biblical Fallen Angel, sometimes the Angel of Death and sometimes the Angel of Destruction. He is notably mentioned to have had an army of locusts. It is unknown whether Titanus Abaddon has any connection to the angel, or whether it's just a codename. (Not seen)

Leviathan
The Leviathan likely refers to the Biblical use, in which the Leviathan is a giant sea creature created by God, usually described as a serpentine crocodile or a whale. This creature is the counterpart to the Behemoth. Leviathan's name may also refer to the definitions of leviathan, either a large aquatic creature or a thing that is very large or powerful. Leviathan was found in Loch Ness by Monarch, and an outpost was built around it. (Not seen)

Sargon
Titanus Sargon's name may refer to the Sargon genus of beetle, possibly meaning that Sargon is beetle-like. (Not seen)

Bunyip
The "bunyip" is a large Australian cryptid found in shallow water, similar to a hippopotamus. It is unknown whether bunyip sightings are really Titanus Bunyip, or if Titanus Bunyip was given its name by Monarch for a different and unknown reason. (Not seen)

Mokele-Mbembe
In the novelization, Mokele-Mbembe is described as a grey quadruped with a pebbled reptilian back, with a head resembling an earless elephant, although the tusks point down instead of up. His forelimbs are large and five-clawed, and his rear limbs are slightly smaller, while his tail is twice as long as the rest of his body. His mouth opens like a crocodile's to reveal sharp teeth. (Not seen)

Quetzalcoatl
Quetzalcoatl's name comes from a feathered serpent deity from Aztec mythology. (Not seen)​

Tiamat
No info. (Not seen)

Kraken
The "Kraken" is a giant squid cryptid. antagonistic towards sea vessels, similarly to Kraken himself. However, "Kraken" is just a nickname for the undesignated Titan, and it is unknown if he is the actual Kraken legend.
Kraken greatly resembles an octopus or a squid, but with a massive brain protected by a cone of shell.

Note: Several (above) are named for destructive gods, archangels and demonic deities. Two—Mokele-Mbembe and Bunyip—are named for undiscovered “cryptids,” sometimes sought by real-world monster hunters. Mokele-Mbembe is an apatosaurus-like creature reported by early 20th century European big game hunters to be living deep in swamps and at the mouths of rivers in central Africa. The bunyip comes from Australian Aboriginal mythology and is a dreaded creature that lurks in wait beneath the surface of ponds and rivers.

Godzilla is a 30-minute animated series co-produced between Hanna-Barbera Productions and Toho Ltd. in 1978 and aired on NBC in the United States and TV Tokyo in Japan. The series is an animated adaptation of the Japanese Godzilla movies produced by Toho. The series continued to air until 1981, for a time airing in its own half-hour timeslot until its cancellation.

Format
The series follows the adventures of a team of scientists on the Calico, a hydrofoil research vessel, headed by Captain Carl Majors. The rest of the crew include scientist Dr. Quinn Darien, her nephew Pete, and her research assistant Brock. Also along for the ride is Godzuki, the "cowardly cousin" of Godzilla and Pete's best friend, who has a lighthearted role in the show. Godzuki can attempt to fly using the small wings under his arms. Whenever Godzuki tries to breathe fire, he usually just coughs up smoke rings.

The group often call upon Godzilla by using a special communicator when in peril, such as attacks by other giant monsters. Godzuki is also able to howl to summon Godzilla. Godzilla's size in the animated series shifts radically, sometimes within a single episode or even one scene. For instance, Godzilla's claw can wrap around a large ship, and only minutes later the team of scientists fit rather neatly on Godzilla's palm. In addition, Godzilla's trademark atomic breath is altered so he breathes simple fire. He can also shoot laser beams from his eyes much like Superman's heat vision.

Hanna-Barbera was unable to use Godzilla's trademark roar, so they cast Ted Cassidy to voice the character, similar to his role in the live-action series The Incredible Hulk. 

Production
In regards to the origin of the series, Joseph Barbera came up with the idea of licensing Godzilla. He explained in a 1990's interview "My job back then was to dig up new characters, new ideas, new shows, and I had wanted to do Godzilla for awhile. I liked the monster thing, and the way it looked, and I thought we could do a lot with it. So I contacted Henry Saperstein, who was a very good friend and we got talking about it. Then there was an executive at the network who wanted to get into the act, and urged us to lighten the story line up. So, I came up with the character Godzooky, who was like his son. The show had a sort of father-son relationship, which we had done before on shows like Augie Doggie and Jonny Quest.

Barbera also explained why the show had little violence and deviated from the source material. "The problem with the show was simply this: When they start telling you in Standards and practices, "Don't shoot any flame at anybody, don't step on any buildings or cars," then pretty soon, they've taken away all the stuff he represents. That became the problem, to maintain a feeling of Godzilla and at the same time cut down everything that he did. We managed to get a fair show out of it. It was OK. Godzooky kind of got the kids going.

Voices
Jeff David - Captain Carl Majors
Brenda Thompson - Quinn
Hilly Hicks - Brock
Al Eisenmann - Pete
Don Messick - Godzuki
Ted Cassidy - Godzilla

​Series Monsters And Villains
Season 1
The Fire Bird (Episode 1)
The Earth Eater (Episode 2)
The Stone Creatures (AKA The Guardians of Ramal, Episode 3)
The Megavolt Monsters (Episode 4)
The Seaweed Monster (Episode 5)
The Energy Beast (Episode 6)
The Colossus of Atlantis (Episode 7)
The Cyclops Creature (Episode 8)
The Chimera (Episode 9)
The Minotaur (Episode 9)
The Sirens (Morphea is the only one named, Episode 9)
The Magnetic Monster (Episode 10)
The Breeder Beast (Episode 11)
The Watchuka (Episode 12)
Great Watchuka (Episode 12)
Diplodocus (Episode 13)
Carnivorous Plant (Episode 13)
Time Dragon (Episode 13)

​Season 2
Godzooky Clone (Episode 14)
Voltrang's Clone Monster (AKA The Giant Squid, Episode 14)
Giant Fly (Episode 15)
Giant Octopus (Episode 16)
Axor (Episode 17)
The Power Dragon (Episode 18)
The Cyborg Whale (Episode 19)
Magma Lizards (Episode 20)
Moon Monster (AKA 'Gravity Goliath', Episode 21)
The Golden Guardians (Episode 22)
Flying Manta Ray (Episode 23)
Spider Crab (Episode 23)
Jellyfish (Episode 23)
Sea Turtle (Episode 23)
Tropical Fish (Episode 23)
Sharks (Episode 23)
Squids (Episode 23)
Electric Eels (Episode 23)
Giant Black Widow (Episode 24)
Venus Flytrap (Episode 24)
Ants (Episode 24)
Giant Beetle (Episode 24)
Giant Antlion (Episode 24)
Bees (Episode 24)
Dragonfly (Episode 24)
COBRA group (a fictional terrorist group armed with modern weapons technology, not to be confused with the group of the same name from the G.I. Joe franchise) (Episode 25)
The Ice People of Frios (Episode 26)

Broadcast History
Godzilla originally aired in the following formats on NBC:
The Godzilla Power Hour (September 9, 1978 – October 28, 1978)
The Godzilla Super 90 (November 4, 1978 – September 1, 1979)
Godzilla (September 8, 1979 – December 1, 1979)
The Godzilla/Globetrotters Adventure Hour (December 8, 1979 – September 20, 1980)
The Godzilla/Dynomutt Hour (September 27, 1980 – November 15, 1980)
The Godzilla/Hong Kong Phooey Hour (November 22, 1980 – May 16, 1981)
Godzilla (May 23, 1981 – September 5, 1981)
The Godzilla Power Hour consisted of half-hour episodes of Godzilla and Jana of the Jungle. A total of 13 original episodes were produced in 1978, with the first eight airing as part of The Godzilla Power Hour. In November 1978, the show was expanded to 90 minutes with the addition of Jonny Quest reruns and retitled The Godzilla Super 90.

For the second season beginning in September 1979, the show was separated from its package programs and aired in its own half-hour timeslot as simply Godzilla. The original plan was to keep it as part of another 90 minute arc. Only it was to be paired up with episodes of The Shmoo and The Thing. The planned title was Godzilla Meets the Shmoo and The Thing.[2] However these plans dissolved, and the show was simply aired on its own in its own half hour timeslot. Hanna-Barbera would pair episodes of The New Fred and Barney Show with the Shmoo and the Thing instead as Fred and Barney Meet the Shmoo. A month later, new episodes of Godzilla and The Super Globetrotters were packaged together as The Godzilla/Globetrotters Adventure Hour which ran until September 1980.

On September 27, 1980, after 26 half-hour episodes, the show went into reruns and Godzilla was once again teamed up with other Hanna-Barbera characters: The Godzilla/Dynomutt Hour ran until November 1980, followed by The Godzilla/Hong Kong Phooey Hour which ran until May 16, 1981. On May 23, the show returned to the half-hour format as Godzilla and the last regular showing aired on September 5, 1981 (to be replaced by The Smurfs, which would last three times as long). Throughout the 1980s until the late-1990s, the series rested in limbo (with the exception of a limited videocassette release of two episodes). Since 1993, it has been rebroadcast on TNT, Cartoon Network and Boomerang.

The Oxygen Destroyer (オキシジェン・デストロイヤ, Okishijen Desutoroiyā) was a fictional weapon of mass destruction used to kill Godzilla in the 1954 Godzilla film, Gojira.

Origins
It was the invention of Dr. Daisuke Serizawa, who feared the power of the device that he created.

History
Showa Series
Gojira
The weapon was first revealed to Emiko Yamane by Daisuke Serizawa when they were in his lab. He demonstrated it on a tank of fish, which were instantly reduced to skeletons.

Fearing that it would lead to another arms race, the doctor sacrificed himself as he detonated his device underwater, killing both Godzilla and the chance that his device would become a weapon.

Heisei Series
Godzilla vs. Destoroyah
The Oxygen Destroyer would carry on a larger role, and was later revealed to have awoken prehistoric creatures that mutated into the monster Destoroyah in the 1995 film Godzilla vs. Destoroyah. That film also noted that "if it had been used on the ground, it's quite obvious that Tokyo would've become a cemetery."

The chemical reaction initiated by the weapon (which is the actual part that destroys the oxygen) also powers one of Destoroyah's attacks, a beam of micro-oxygen, in the shape of a double-helix, with the destructive power of the Oxygen Destroyer itself.

Millennium Series
Godzilla Against MechaGodzilla
In Godzilla Against MechaGodzilla, the Oxygen Destroyer didn't dissolve Godzilla's skeleton, and Kiryu's blueprints incorporated the original Godzilla's skeleton within it to make the design process and construction less strenuous.

Mechanisms
The device works by releasing a chemical stored within it's spherical center. Once released, the chemical (dubbed Micro-Oxygen) reacts violently with the water, isolating oxygen molecules and splitting them. The molecules are then liquified. This means that any organism exposed to the chemical will first suffocate from the lack of oxygen, and then disintegrate. Depending on the amount of the oxygen destroying chemical released, the body of the victim will either be eaten down to the bone or destroyed completely. When used to its full potential, the Oxygen Destroyer will leave no remains.

Filmography
Gojira
Godzilla vs. Destoroyah (Stock Footage)
Godzilla Against MechaGodzilla (Stock Footage)

Trivia
It should be noted that even though many weapons have been created to kill Godzilla, the Oxygen Destroyer is the only man-made weapon to accomplish this task.
The Oxygen Destroyer prop is the oldest remaining Godzilla prop known, first being used in 1954 and recently seen in 2013, being displayed at the Godzilla Encounter, making the prop over 59 years old at the time.

Bagan (バガン, Bagan) is a super kaiju created by Toho Studios that first appeared in the 1993 Godzilla video game, Super Godzilla, but was intended to appear in many films, all of which were scrapped.

History
Version #1
The Return of Godzilla
The first version of Bagan, from the first draft of The Return of Godzilla, was a shape-shifter. It started out as an ape-like creature but after being wounded it became a dragon-like creature. Each time it changed it healed itself. It dives into the sea and becomes fish-like. Bagan runs into Godzilla, but finding that it can't defeat him in any single form, it makes a towering, combined form. But after this, it can no longer change shape, meaning it can no longer heal itself, allowing Godzilla to defeat it.

Version #2
Mothra vs. Bagan
In Mothra vs. Bagan, Bagan is an ancient creature that protects the land of China. He was frozen in the Himalayas long ago but now, due to global warming, the beast breaks free. He sees the damage humans have done to the land and begins to attack them, but Mothra intervenes. As the fight between the two monsters takes them to Singapore, Mothra's egg hatches and the larva arrives to help its parent. Despite their combined attempts to stop the creature, Bagan kills the adult Mothra and moves on. The larva cocoons itself and becomes an adult Mothra, attacking and defeating Bagan in Hong Kong. Unfortunately, after Godzilla vs. Biollante did not perform as well at the box office as Toho had hoped, they decided not to risk making another movie with another new monster, and so Mothra vs. Bagan was canceled.

Godzilla vs. Bagan
In Godzilla vs. Bagan, Bagan was intended to fight the King of the Monsters himself, Godzilla. Not much else is known, other than the Gotengo was also supposed to fit into the story somehow. Unfortunately, Godzilla vs. Bagan never got past the development stage.

Abilities
The only known powers for the first, Return of Godzilla version of Bagan are shape-shifting and ability to heal himself.

In the storyboards for Mothra vs. Bagan, Bagan is shown to be blowing a hole in one of Mothra's wings with an energy beam from his mouth. He is also shown to be firing some sort of lightning bolt from his main, nasal horn, and growing what seems to be some type of energy-wings out of his back.

The version of Bagan that appeared in Super Godzilla possessed insanely high physical strength and durability. He could slash with his powerful claws ("Slasher Claw"), perform a Diamond Storm (in which he would shoot white, star-like objects from his horns), fire a white Plasma Beam from his mouth and generate a Force Field to block incoming attacks. Bagan's attacks were, bar none, the strongest used by any enemy in the game. In addition, he had the most health out of any enemy in the game and Godzilla's attacks would inflict barely any damage, making it necessary to transform into Super Godzilla to defeat Bagan and complete the game.

Filmography
The Return of Godzilla (1st Draft) (Scrapped)
Mothra vs. Bagan (Scrapped)
Godzilla vs. Bagan (Scrapped)

Video Game Appearances
Super Godzilla
Godzilla Movie Studio Tour
Bagan received a starring role as the final boss in the video game Super Godzilla. Supercharged by cells from Godzilla and King Ghidorah that his alien commanders had spliced into him, Bagan is easily the most powerful foe in the game, generally seen as impossible to defeat as normal Godzilla, and still seen as a difficult fight as Super Godzilla.

Trivia
Bagan is the only known monster to be more physically massive and greater in weight than the final form of Biollante, who weighs in at a lesser 220,000 tons.
Bagan was mentioned by Simon Strange in an interview for Godzilla: Unleashed. He was one of several monsters considered for the game, but was dropped in favor of more obscure monsters (Varan being explicitly stated).
In M.U.G.E.N, Bagan is playable. He is one of the customizable characters in the game. There are two versions.
A video, supposedly consisting of cut footage of Bagan from Godzilla: Final Wars, was uploaded to YouTube on June 19th, 2012. The footage turned out to be a hoax, showing off the monster called Reizaus from the show Super Fleet Sazer-X.
"Bagan" is Indonesian for blueprint or draft. This is interesting considering that Bagan was planned for several movies but scrapped.

Mothra vs. Bagan (Film Concept)
Mothra vs. Bagan was a film proposed in 1990 by Tomoyuki Tanaka. It would have been Mothra's first film since Destroy All Monsters and would have introduced the monster Bagan, who had previously appeared (in a vastly different form) in the scrapped first draft of The Return of Godzilla. The film would have, on an interesting note, included the character of Miki Saegusa (who had appeared only in Godzilla vs. Biollante at that point). However, due not only to the poor box office performance of Godzilla vs. Biollante, but also to the unlikely success of the film over seas, the film (which would have also been very expensive to make) was cancelled. However, much of the plot was recycled for Rebirth of Mothra. Some thing to note is that Desghidorah grows wings near the end, similar to Bagan.

Plot
Thousands of years ago, a giant monster terrorized ancient China. The kaiju, known as Bagan, rose to destroy threats to the Earth. Although the ancient people of China were able to defeat the creature, legend passed down through the ages claimed that the "primordial dragon" would rise again to defend the planet again. In the present day of 1990, the glacier containing Bagan melts from rising global temperatures, and the monster sets its sights of eliminating humanity, now Earth's greatest threat. However, standing in Bagan's way is Mothra, a giant insect monster left behind by an ancient civilization to defend humanity. Mothra confronts Bagan in Singapore, but is soon overwhelmed. Some distance away, in Borneo, a gigantic egg begins to stir, and it soon hatches an infant Mothra, which crawls to help its mother. The three monsters then engage in a series of battles that span the globe. Unfortunately, as the monsters fight in Bangkok, the adult Mothra is killed by Bagan. The larva quickly retreats and spins a cocoon, transforming into an adult Mothra. The two monsters then meet again, this time in Bangladesh, and begin the final battle. Bagan, though, has become even more powerful, and has now grown wings that allow the beast to fly. Fortunately, after a long battle, Bagan is defeated by the younger Mothra and humanity is saved.

Dagahra (ダガーラ, Dagara) is a pollution-consuming kaiju created by Toho Studios that first appeared in the 1997 Toho film, Rebirth of Mothra II.

History
In days long past, a powerful and ancient civilization ruled the land of the rising sun. Known as the Nilai Kanai, these people were technologically and mystically advanced, holding power over science and magic unknown before or after. Yet, their's was not a perfect society. Like the humans of today, they polluted their waters and corrupted their skies with toxins. Rather than change their ways, they chose to play at being gods, and created a being to dispose of their wastes. Known as Dagahra, this creature would consume the pollution that the Nilai Kanai produced, thus cleansing the waters. Dagahra did consume pollution, as it was constructed to, but produced a toxic side effect: barems. Releasing thousands of the acidic sea stars from its body, Dagahra destroyed its creators, then fell into a deep slumber below the waves.

Several thousand years later, Dagahra was reawakened by a new insurgence of pollution into its domain. Awakening to fulfill its purpose once again, the toxic monster emerged from its lair, consuming man's waste and releasing its deadly spawn. Soon, the oceans ran red with its lethal sea-stars. Then, it emerged itself, spreading destruction to the land dwellers that feed it so much waste.

Yet, it was met by a powerful entity, known as Mothra Leo. Battling Leo with all of his might, Dagahra fought the noble Mothra to a standstill. Yet, when he dragged Leo below the water, the advantage was his, and he encrusted the noble warrior with his toxic spawn. As Dagahra forced his foe from the water and onto a recently revived Nilai Kanai pyramid, he closed in to finish the job. Yet, his ancient creators sought to foil him from beyond the grave, as ancient traps activated and bombarded the toxic one with bolts of rainbow lightning. Forced to retreat, Dagahra circled the pyramid, seeking a way to continue his assault on the heroic Leo.

But, just as the tide seemed in his favor, the water spirit Ghogo released his power into the damaged Mothra, reviving him and allowing Leo to rise from defeat and battle against Dagahra. This time, Dagahra was at a disadvantage, as Ghogo's magic gave Leo a powerful boost in energy, as well as the ability to follow Dagahra under the waves to continue his assault. Try as he might, Dagahra couldn't fight off the empowered Leo. Then, his foe did something startling. Splitting apart, Leo dove into Dagahra's stomach. The toxic one was wracked with agony as his enemy literally carved his internal organs apart. As his last dying scream echoed through the depths, Leo dragged his venomous carcass from the water. Purified by the Nilai Kanai temple and Leo's combined power, Dagahra returned to seawater, and was dispersed by Leo. Thus ended the reign of the toxic beast Dagahra, the product of humanity's foolish pride.

Abilities
Dagahra can fly at the speed of mach 10.
Dagahra can fire an Irabushan Beam from his mouth.
Dagahra is able to fire Crimson energy beams from his dorsal fins.
Dagahra can rotate and fire Energy Rings from his body.
Dagahra is able to create a tornado of Barems and lightning by quickly rotating himself underwater.
The two cannons on Dagahra's shoulders can fire either energy beams or a concentrated mixture of Barem and crystallized toxins.
Dagahra is an adept swimmer that can move underwater at 150 knots.
Dagahra can fire lightning at foes.

Trivia
Dagahra is the only villain monster of the Rebirth of Mothra series to not be a Ghidorah.

* * * * * * *

Barem

History 
The byproduct of Dagahra’s feeding on garbage, the Barem made a return before the demonic creature did. Crimson tides began to be reported all across the ocean as the Barem spread wide and far, all the while Dagahra assaulted the coastline and the Nilai Kanai pyramid. Attacking anybody unfortunate enough to get too close, the Barems burned innocent lives with their acidic secretions. When Dagahra was finally destroyed by Rainbow Mothra, the Barem he produced began to die. The species went extinct, leaving the oceans a safe place once again.

Powers
Acid: The Barem are capable of secreting a deadly acid that can burn flesh, and with sufficient quantity, deal heavy damage to even larger monsters.

Appearance 
Rebirth of Mothra 2 (1997)

Desghidorah (デスギドラ, DesuGidora) is the first antagonist monster of the Rebirth of Mothra series.

History
Sixty-seven million years ago, in the Cretaceous period, a demonic three-headed space dragon, Desghidorah, attacked Mars and turned it into a barren wasteland, literally sucking the life out of the planet. This creature, not content to allow just one planet in this solar system to suffer its wrath, advanced to the nearby planet of Earth. Desghidorah began its assault on the planet, but it didn't expect retaliation. A race of intelligent beings called the Elias populated the planet, and they fought against the three-headed demon. The guardians of the Elias, a race of giant moths named Mothra, engaged Desghidorah in battle. The war between the giant insects and the space monster was long and brutal. Finally, the despised dragon was defeated, buried, and sealed in a secret location. Earth, however, was nearly ruined by the great war. The dinosaurs and many other species of animals went extinct, and the civilization of the Elias was almost obliterated. In the end, only three beings of this ancient species survived; their names were Moll, Lora, and Belvera. Moll and Lora became the avatars of Mothra, but Belvera, corrupted by the loss of her species, became evil. She sought to one day release Desghidorah upon this world once more.

By the year 1997, deforestation and pollution were at a fever pitch. A logging company was clearing out the lush and beautiful Hokkaido forests, when the workers stumbled upon a strange buried structure with ancient writing. One of the workers discovered a small pendant at the center of the object and removed it, which caused the earth to suddenly quake. He gave the pendant to his daughter as a present, but Belvera quickly located the little girl and stole the pendant, the "Seal of Elias," from her. Seeking out their sinister sister, Moll and Lora arrived to recover the seal. Belvera fought against her siblings for control of the seal, but Belvera and her reptilian steed, Garu-Garu, prevailed and escaped. Moll and Lora's transport, Fairy, was unable to fly, and the twin fairies were grounded. They explained to the humans that the seal had been holding Desghidorah captive for many years, and with it, Belvera would attempt to control the terrible monster.

At the site where the ancient artifact was uncovered, the ground shook violently, and Desghidorah's tomb began to rise into the sky. The man who discovered the seal was placed under the control of Belvera, who used him to demolish the tomb by driving a bulldozer carrying a load of dynamite directly into the jagged structure. Her plan was a success, and after it absorbed a massive amount of energy from the surrounding forests, Desghidorah announced its triumphant return to a terrified world. The violent beast continued to draw the life out of the forest, for it was planning to soon gain enough energy to take to the skies on crimson wings.

The Elias watched in horror, and they knew what they must do, Mothra was the only being that could stand a chance against this soaring savage, so they called upon their guardian to come forth and do battle with the wicked creature once more. Mothra was protecting her newly laid egg, but when she was summoned, she flew to Japan to fight the three-headed demon. Mothra attacked Desghidorah, and the two engaged in mortal combat, Mothra, however, was old and weak after giving birth, and Desghidorah was far too vicious for her to handle. Desghidorah relentlessly attacked Mothra, causing great harm to the benign protector. Sensing his mother's dismay, the egg that Mothra left behind began to hatch, even though it hadn't grown thoroughly enough. The baby began his journey to assist his mother, and when the larva arrived on the scene of the battle, it attacked Desghidorah using its energized silk. This new rival momentarily confused the grotesque gargantuan, but it swiftly located the young creature and bit into his soft flesh. It sadistically lifted the now defenseless young creature in its horrible mouths, and beat the tiny monster against the ground as blood spewed from its wounds. The infant was thrown aside as his mother came to his defense. Desghidorah and Mothra battled fiercely, but she was again repelled. The larval Mothra camouflaged himself and continued his attack. When Desghidorah discovered his location, Mothra entered the fray once again. She lured Desghidorah into a waterway, and caused him to destroy a dam. Mothra grabbed her infant and fled the scene as Desghidorah was washed away by the fury of the surging water.

Mothra flew out to the sea to safety, but she was far too weak to go any further. She dropped her child into the water and crashed into the surf, not far ahead of him. The baby attempted with futility to keep her afloat, but she sank below the surface to a watery grave. Her Elias companions wept for her, but her infant was ready to incite swift and brutal revenge on his mother's murderer. He swam away and formed a chrysalis and began to metamorphosize.

Desghidorah, now unopposed, continued to absorb the life out of Hokkaido, creating a massive cloud that covered the island. Eventually, it gained enough energy, and, from its stone-like back, it sprouted two mighty wings. Desghidorah was finally ready to take on the world in full force.

The Mothra Larva sought out an ancient, powerful tree and by using its energy, transformed into an even more powerful adult Mothra. The new Mothra once again engaged Desghidorah in battle, this time defeating him and once again imprisoning him within his ancient mountain prison, never to be seen again.

Abilities
Land Form
Desghidorah can emit Hell's Flame from the mouth of his middle head.
Desghidorah spits fireballs from the mouths of all three of his heads.
Desghidorah is able to perform a Shock Pulse.
Desghidorah can unleash a powerful shockwave released from all over his body.
Desghidorah can send a red electric surge through his bites.
Desghidorah is able to do a Fiery Prye Road by causing the ground to split open & release flames from within the earth.
Flying Form
Desghidorah flies at the speed of Mach 23.
Desghidorah can release hurricane winds from his wings.

Trivia
Desghidorah's wings bare a striking resemblance to Destoroyah's.
Desghidorah has many resemblances to Keizer Ghidorah - four-legged, and (in its first form) apparently flightless.
Desghidorah's roar was later reused for the Ultraman Tiga monster Gatanozoa.

Minilla (ミニラ Minira) is a Kaiju (Japanese giant monster) from the Godzilla series of films and is the first of several young Godzillas. He first appeared in the Showa film Son of Godzilla and also appeared in Destroy All Monsters, All Monsters Attack, Godzilla vs Gigan and the Millennium film Godzilla: Final Wars. Also called Minya.

Origin
The son of the famous Godzilla, Minilla was born on Sogell Island, when his egg was prematurely cracked open by a group of mutant giant praying mantis' called Kamacuras. Godzilla soon arrived, killed two of the Kamacuras, and rescued Minilla. Godzilla proceeded to train Minilla and defended him against further attacks from the final Kamacuras and the giant spider Kumonga. Godzilla and Minilla were placed in hibernation when a group of scientists completed a weather experiment, resulting in the freezing of their island. The mutant dinosaurs revived when the snow melted, and eventually relocated to Monster Island, as seen via stock footage in Godzilla vs. Gigan.

In Destroy All Monsters (which takes place in 1999), Minilla, Godzilla and many other Earth monsters live on a new island called Monsterland. Together they battled the three-headed space dragon King Ghidorah at Mt. Fuji. They killed Ghidorah and saved planet Earth. After that, Minilla and the other monsters returned to Monsterland.
Godzilla's exact relationship to Minilla has never been clarified. It is uncertain whether he was of a derelict egg of the same or a similar species or if Godzilla was somehow Minilla's biological parent; (human character dialogue might suggest that Godzilla had been to Sogell Island prior to the events of Son of Godzilla).
Minilla is the first juvenile Godzilla to be featured in the film series. A later young Godzilla appears as Godzilla Junior during the Heisei series, in the last three films of the Heisei series of Godzilla films.

Appearance
Minilla resembles a smaller, pudgy version of his father. His snout is slightly upturned and his eyes are larger and placed further forward on his head, giving him a more human-like appearance. The dorsal fins on his back are small and unformed, and he also lacks the charcoal grey color of his father. His coloring is a lighter, fleshy grey color.

Powers and abilities
Minilla is much more friendly with humans than any of his contemporaries, and once (in All Monsters Attack) appeared in the dreams of a troubled boy in order to give an example of how to deal with bullying and other childhood issues. He is also very playful, enjoying such games as kicking large boulders and jumping over or riding on Godzilla's tail. While he is usually fearful of other monsters, he occasionally shows courage when defending his human friends, although more often than not he is outmatched by other monsters. The All Monsters Attack appearance is also notable in that it is the only instance of Minilla speaking, which makes sense since he only appears in dreams.
He is most notable for his ability to breathe atomic smoke rings, though he did learn to use a real atomic ray in Son of Godzilla. Minilla also has the ability to communicate with Godzilla over great distances by broadcasting a brainwave pattern over radio frequencies. This ability interferes with other radio transmissions in its vicinity. In All Monsters Attack Minilla is depicted as having the ability to shrink down to human size. This was originally meant to be indicative of the fantasy element of the film, in which Minilla only appears in the dreams of a young boy. This power is depicted again, in the real world, in the Millennium film Godzilla: Final Wars.
Minilla reappeared in a slightly altered form in Godzilla: Final Wars which, as part of the Millennium series, was not directly connected to any of his previous appearances. His role, however, was unchanged; very human-friendly, especially towards children. He also interceded on behalf of humanity to Godzilla, prompting Godzilla to end his war with the human race.

Film appearances
Son of Godzilla
Destroy All Monsters
All Monsters Attack
Godzilla vs. Gigan (Stock footage)
Godzilla: Final Wars

Video games
Minilla's only playable video game appearance has been on the Sega Dreamcast game Godzilla Generations. A secret character that is unlocked after completing the game with the American Godzilla, Minilla is the shortest of the playable characters and also the weakest in terms of defense. His speed is average, and his breath weapon, atomic smoke rings, is not very powerful, as several uses are required to defeat even the Super X.
Minilla appears as the story's goal in "Godzilla", a 1990 Game Boy puzzler. In the game, he is trapped in a large maze. He awaits rescue by his father Godzilla, the player's character. The only point in which Minilla appears is during the ending sequence.

Cultural references
In the M*A*S*H* episode "Springtime," Radar O'Reilly asks a nurse played by Mary Kay Place if she would like to accompany him to a screening of "Firstborn of Godzilla" and remarks, "I saw the original—before Godzilla got married."

Oodako (オオダコ, Ōdako) is a giant octopus kaiju created by Toho Studios that first appeared in the 1962 Godzilla film, King Kong vs. Godzilla. It returned in War of the Gargantuas. Oodako is also known as the "Daidako" (Giant Octopus) and "The Giant Devilfish". Oodako also appeared in the alternate ending for the movie Frankenstein Conquers the World.

Name
Toho's official name for the creature is simply "Giant Octopus", as shown in promotional material for Godzilla: Tokyo S.O.S.. Oodako is a fanmade nickname which translates to giant octopus, like Ootokage for the giant lizard and Ookondoru for the giant condor.

History
King Kong vs. Godzilla
In King Kong vs. Godzilla, Oodako crawls ashore on Farou Island and attacks a village hut in an attempt to get the special soma berry juice that the natives store there. The natives, along with members of a pharmaceutical company, attempt to defeat Oodako with spears and shotguns, but to no avail. King Kong then appears behind a giant wooden fence, crumbling it with his bare hands and throwing the pieces at Oodako. Kong grabs Oodako, but the octopus holds tightly on to Kong's head. After a short struggle, Kong pulls the monster off and throws it to the ground. He then throws two boulders at Oodako's head. Oodako flees back to the beach and presumably returned to the sea, Kong beating his chest and roaring in victory.

Frankenstein vs. Baragon
In the alternate ending for Frankenstein Conquers the World, after Frankenstein defeats Baragon, Oodako comes from the sea and fights Frankenstein. Frankenstein battles fiercely, but can't compete with Oodako's numerous and powerful tentacles. Oodako drags Frankenstein in to the water, seemingly to his death.

War of the Gargantuas
In War of the Gargantuas, Oodako attacks a fishing boat, but is defeated by the Green Gargantua, Gaira.

Filmography
King Kong vs. Godzilla
War of the Gargantuas
Frankenstein vs. Baragon (Alternate Ending)

Kumonga (クモンガ, Kumonga) is a giant spider kaiju created by Toho Studios that first faced Godzilla in the 1967 Godzilla film, Son of Godzilla. He is also known as Spiega, a name given to him for English language audiences.

History
According to the journal of the now deceased Dr. Matsumia, Kumonga was a type of very large spider to dwell in the jungle of Sogellel Island. However, exposure to the radioactive storm created by the UN’s failed weather experiment transformed Kumonga into a 45-meter tall monster.

Showa Series
Kumonga in the Showa SeriesIn the Showa era, Kumonga was a giant spider that lived in Sogell Island. It first appeared when it trapped and poisoned Kamacuras. Then it trapped Godzilla's son, Minilla in webbing and closed in for the kill. However, Godzilla arrived and defended his son. Kumonga attacked and nearly succeeded in killing Godzilla, but Minilla helped his father and using their atomic rays, they burned Kumonga's body, severely injuring it. However, Kumonga was not dead and the scientists placed Kumonga on Monsterland, where it lived with many other monsters including Gorosaurus, Varan, and Manda. In 1999, aliens known as Kilaaks, captured and mind-controlled the monsters of the island. The kaiju were released in cities throughout the world. But in the end, the humans broke the mind-control and freed the monsters. The monsters were then sent to attack and destroy King Ghidorah. Kumonga took part in the fight by trapping King Ghidorah in the thick webbing.
After King Ghidorah was defeated, Kumonga and the other monsters returned to Monsterland and lived peacefully to this day.

Milennium Series
Kumonga was featured in the 2004 movie, Godzilla: Final Wars, not that different in appearance, as one of the many mind-controlled monsters of the Xilians. It appears in a desert in Arizona where it destroys a trailer. Then suddenly, the Xilians teleport the spider and the other monsters around the world. They tell the humans that they took the monsters away to save Earth. However, the humans find that the Xilians were controlling the monsters and the Xilians release all the monsters again to finish destroying the cities they were attacking. When Godzilla is freed from the south pole and fights the alien-controlled kaiju, defeating Gigan and Zilla. Through the alien leader's command, Kumonga is released in New Guinea to battle him. Godzilla approached the monstrous arachnid and let loose a roar to announce his presence. At first, Kumonga was able to trap Godzilla in thick webbing, but Godzilla managed to grab a strand of webbing that was still attached to Kumonga and swung it around in circles before letting go of the webbing. Kumonga soared over the horizon and was not seen again. It is unknown if he dies or not.

Abilities
Kumonga can shoot a thick webbing and a stinger from his mandibles. Kumonga has prehensile pedipalps that can be used to grab small prey. The Showa version was able to survive multiple hits from Godzilla's atomic ray. The Millennium Kumonga's web was able to expand on contact with air from a single thread into a net for incapacitating foes. It also has long legs ending in sharp points which can be used to skewer opponents or crush through materials like in a scene in the movie Godzilla Final Wars.

Filmography
Son of Godzilla
Destroy All Monsters
All Monsters Attack (stock footage)
Godzilla vs. Gigan (stock footage)
Godzilla: Final Wars

Video Game Appearances
Godzilla vs. 3 Major Monsters
Gojira-Kun
Godzilla Trading Battle
Godzilla: Unleashed (Scrapped due to timing and budget)

King Caesar (キングシーサー Kingu Shisa) is a fictional Kaiju from the Toho produced Godzilla series. King Caesar's appearance was inspired by the Shisa, a beast that looks like a combination between a dog and a lion. It first appeared in the 1974 Showa film Godzilla vs. Mechagodzilla. It then appeared thirty years later in the 2004 Millennium film Godzilla: Final Wars.

Appearance
King Caesar is a combination of a dog and a lion, and possibly some type of reptile. He has large clumps of light brown fur growing on different areas of his body. His skin is made up of brown scales. King Caesar has a row of gems on his head that make up a crown like shape. In order to awaken King Caesar, a direct descendent of the royal Azumi family must sing his activation song. Years later when King Caesar appeared in Godzilla Final Wars he did not need a song to awaken.

Special powers
Within the context of the character's fictional universe, King Caesar possesses remarkable speed, athleticism, durability and fighting prowess. King Caesar also had the ability to shoot energy back at his opponents if they shoot energy attacks into his eyes. He used this twice with great effectiveness against Mechagodzilla before the robot wisely changed tactics and used missiles instead.
The Millennium incarnation in particular displayed great lower body strength, and was able to leap high in the air and roundhouse-kick the much heavier and spiked Anguirus like a soccer ball. In the video game Godzilla: Unleashed, King Caesar was able to absorb sunlight and release it as a beam weapon; this ability was never shown in the film continuity.

Origins
Showa
In Godzilla vs. Mechagodzilla, King Caesar was the guardian of the Azumi family. He could be awakened by fulfilling a prophecy and an ancient song.
The Simians knew about Caesar and that it would awaken to prevent them from attempting world domination. When their Mechagodzilla was repaired after being damaged, the aliens sent the cyborg to conquer the Earth once more.
King Caesar was awakened and he confronted the robot. At the beginning, Caesar was able to successfully fight back by reflecting the cyborg's laser beams through his own eyes and then reflecting the projectiles back at his adversary. However, Mechagodzilla was too strong even for the guardian and almost defeated Caesar.
However, Godzilla arrived to aid King Caesar. Still, Mechagodzilla was more powerful than both of them and horribly outmatched the duo. Godzilla, who had been struck by lightning repeatedly prior to this battle, converted that electrical power into an electro-magnetic attraction ability, essentially becoming a living super electro-magnet during the fight and used it to pull Mechagodzilla towards him when the latter attempted to flee when it began to run low on power and ammunition. Godzilla held his robotic clone in place, allowing Caesar to ram the giant robot repeatedly. Godzilla finished off the machine by ripping off its head, and fell into the sea when Mechagodzilla's body exploded. King Caesar then returned to the rock formation from where he emerged. The alien base built into the mountain then self-destructed, sealing the entry and allowing King Caesar to rest peacefully until he would be needed again.

Millennium
In Godzilla: Final Wars, King Caesar was one of the many controlled monsters of a race of alien beings known as the Xiliens. He appears in Okinawa (in a twist of irony, as he was its protector in the Showa series). King Caesar stomps through a factory, crushing everything in his path. Suddenly, an enormous flying object arrives on the scene and removes the giant monster.
The same thing happens to all the other monsters that were attacking the cities throughout the world. The Xiliens come and tell Earth that they saw that the planet was under attack and destroyed the towering titans to save Earth and that a meteor is falling to Earth, threatening all life.
However, it is discovered that the Xiliens were controlling the various monsters and that the meteor did not exist. The Xiliens then release the monsters to finish destroying the cities. However, the crew of the Gotengo freed Godzilla and lured him to the places where the controlled monsters were so he could fight them.
King Caesar, Anguirus and Rodan are pitted against Godzilla at Mt. Fuji. He successfully defeats all three monsters. King Caesar, Anguirus and Rodan are then left in a heap at the base of the mountain. Godzilla did not kill his fallen foes as a nod to their status as allies of Godzilla during the Showa era. This is in contrast to the remaining majority of the monsters seen in the film, all of whom, aside from Zilla, were enemies of Godzilla during the Showa era, and were slain either by Godzilla, the Gotengo, or the mutants who were part of an anti-monster task force near the beginning of the film.

Film Appearances
Godzilla vs. Mechagodzilla
Terror of Mechagodzilla (Stock Footage)
Godzilla Final Wars

Video games
King Caesar appears in the video games Godzilla Trading Battle, Godzilla: Unleashed as a playable character, sporting a look with similarities to both Showa and Millennium era designs. He is able to fire solar heat beams from his eyes.