Megaguirus (メガギラス Megagirasu) is a kaiju, a type of fictional monster, who first appeared in the 2000 movie Godzilla vs. Megaguirus. A mutated version of the fictional meganulon, Megaguirus is regarded as the queen of the species; according to Toho, she is about 50 meters (164 feet) in length, has a wingspan of 80 meters (262 feet) and weighs roughly 12,000 tonnes (13,220 tons). The first and only major appearance of the creature was in the 2000 film Godzilla vs. Megaguirus, she also had a brief cameo appearance in Godzilla: Final Wars.

Character history
Although the species of meganulon, the origin of Megaguirus, were first depicted in the 1956 movie Rodan, the monster itself did not appear until its debut in 2000. Megaguirus was first mentioned in the movie Godzilla vs. Megaguirus after a swarm of meganulon absorbed energy from Godzilla and quickly fled to a flooded section of Tokyo. After diving into the flood waters, the entire swarm latched on to an enormous, mutated version of meganulon. This mutated creature, regarded as the queen, begins to molt once enough energy had been obtained. After leaving behind its exoskeleton, Megaguirus rose above the water's surface and entered the skies of Tokyo.
Immediately after getting above water, Megaguirus began its rampage of Tokyo, destroying numerous buildings by creating super sonic shock waves with its wings. The Japanese military, already deployed to the city to assist in evacuating residents caught in the flood, was helpless to stop Megaguirus. In addition to being practically immune to bullets, its wings emitted a piercing buzz which forced people to stop what they were doing and cover their ears in pain. Before leaving the city, the creature leveled a skyscraper and caused a chain reaction of explosions in several other buildings near where it was born. Several days later, Megaguirus returned to Tokyo in pursuit of Godzilla.

Moments before Megaguirus's second arrival in Tokyo, the G-Graspers a legion of anti-Godzilla soldiers in the Japan Self Defense Unit, attempts to take down Godzilla "once and for all." However, Megaguirus interrupts this and begins a lengthy duel with Godzilla. Initially, Megaguirus takes Godzilla by surprise, using its speed to avoid Godzilla's attacks, including its atomic breath, as well as knock it over multiple times. Eventually, Megaguirus grabs onto Godzilla's neck with its vice-like claws. Although Godzilla breaks free of the grasp and begins to charge up his atomic breath, Megaguirus jabs Godzilla with her stinger and begins absorbing energy, preventing Godzilla from using its atomic breath while giving more power to Megaguirus.
After having its stinger pulled out of Godzilla, Megaguirus uses the newly obtained energy to pick Godzilla up and throw him into a building. Once Godzilla recovered, Megaguirus again stabs him with her stinger, but this time, Godzilla grabs Megaguirus's tail and slams it into the ground and follows through by tackling her. Shortly thereafter, Megaguirus uses the absorbed energy to launch an "atomic blast" which caused Godzilla to collapse. Seemingly having defeated Godzilla, Megaguirus goes in for the kill, but just as she makes her move, Godzilla quickly gets up and bites off Megaguirus's stinger. Stunned, Megaguirus floats backwards from Godzilla, only to be set aflame by his atomic breath. To ensure his victory, Godzilla hits Megaguirus again, causing her to explode into a ball of fire before the burning remains fell to the ground and exploded for a final time.

Abilities
Similar to nearly every monster in the Godzilla series, Megaguirus was at one point exposed to radioactive materials, resulting in a substantial increase in strength, speed and size. After obtaining energy from the minor meganulon, Megaguirus is able to fly at incredibly fast speeds, up to mach 4. It is able to flap its dragonfly-like wings at super-sonic speeds, creating shock waves that can destroy buildings. Its enlarged tail works similar to the stinger of a scorpion, it jabs its foe and latches on to it. Once the stinger is in Megaguirus's opponent, it can either absorb energy for itself or release a blast of energy composed of its opponents beam weapon. Additionally, while flying, its wings cause electronic disturbances.

Video games
Megaguirus has appeared in three video games produced by Atari since Godzilla vs. Megaguirus came out in 2000. Of these, the creature is a playable character in two and an AI-controlled boss or enemy in one.
Godzilla: Save the Earth (2004): One of 18 playable characters in this melee game. Megaguirus is regarded as the fastest creature in the game and retains one of its signature features as an attack, stealing energy through its tail. The game was designed for the Xbox and PlayStation 2 platforms.
Godzilla: Unleashed (2007): One of 26 playable characters in this 3D fighting game. Megaguirus is part of the "Mutant" faction of monsters and remains the fastest character. This game was designed for the Wii and PlayStation 2 platforms.
Godzilla Unleashed: Double Smash (2007): A shorter, less encompassing version of Godzilla: Unleashed designed for the Nintendo DS. However, unlike the console version, in Double Smash, Megaguirus is not a playable character and has a minimal part in the game.

Trivia
Skeetera from Godzilla: the Series has similar powers as Megaguirus.
This is the first prehistoric insect to fight Godzilla.
There is a useful glitch in Godzilla: Unleashed, where Megaguirus is able to use a beam indefinitely (forever), taking the weapon after stealing the opponents energy first.
The Meganulon are based off of an actual prehistoric species of dragonfly, called Meganeura. These dragonflies lived before the dinosaurs, in the Carboniferous era, and were as large as seagulls. Many giant insects evolved during the carboniferous because of the high amount of oxygen in the air.
In the movie, it is unclear as to whether Megaguirus is prehistoric or extradimensional, because her egg was brought to Earth (or possibly mutated, it never says) by a man-made black hole called the Dimension Tide.
The Meganulon's first appearance was actually in the movie Rodan.

Maguma is a fictional kaiju (giant monster) featured in the Japanese science fiction tokusatsu film Gorath, released by Toho in 1962. Based upon the giant walrus (sometimes refered to as "Odobenus rosmarus magnus") and named after subterranean molten rock (magma), the Maguma suit was designed by special effects director Eiji Tsuburaya, and worn by stuntman Haruo Nakajima, who frequently performed kaiju in Toho films of the era (including their most famous monster character, Godzilla). Maguma is the only monster in the film, the focus of which is a runaway collapsed star on a collision course with Earth.

History
Trapped for centuries in an icy tomb, the massive walrus was awoken from its ancient slumber when gigantic rockets were implanted on the North Pole to move the Earth away from the oncoming rogue star Gorath. Awakening with a thirst for carnage, Maguma lashed out at the base and damaged it before retreating back into its home valley. Knowing something was going on that involved a ravenous monster, a VTOL craft was dispatched to handle the creature. The ship buried the walrus under hundreds of tons of rock, but even this couldn't kill the monster.

Maguma rose up and charged the small humans before it. The group of three retreated back to their ship and then to the safety of the sky. The beast snarled again before the craft unleashed more streams of searing energy on it. Unable to cope with such an attack, Maguma fell to its side and breathed its last breath.

Video Game Appearances
Godzilla Generations

Roar
Maguma stars as the antagonist. Maguma's roar was basically a elephant's roar, but was deepened and slowed down.

Trivia
Just like Ebirah, Maguma was originally of Godzilla's allies for Destroy All Monsters, but was replaced, by Gorosaurus, Minya and Anguirus.
Maguma often appears in the Toho Kingdom Toons.

Kamacuras (カマキラス, Kamakirasu) is a giant mantis (sometimes a species of mantis) that first appeared in the film Son of Godzilla.

History
Showa Series
Son of Godzilla
When a United Nations weather control experiment on the Solgell Island accidentally caused a radioactive storm in 1967, the island was doused in a radioactive rainstorm that caused at least three of the island’s already two-meter-long praying mantis' to mutate into 50-meter monsters. After scaring the United Nations crew for a while, the Kamacuras uncovered and attacked Minilla's egg, breaking it open and then proceeding to try and devour the young monster. Godzilla, hearing the cries of Minilla, arrived on the island and quickly killed two of the Kamacuras with his radioactive heat ray, but one managed to escape. Later, Kumonga, the giant spider, killed the third Kamacuras in battle when he entangled the giant mantis in his webbing and jabbed it with his poison stinger.

All Monsters Attack
The monsters also makes a breif appearance in All Monsters Attack, as a small pack of them attack Godzilla, only to be killed quickly and easily by the King of Monsters (along with Kumonga, Ebirah, Giant Condor, and a few fighter jets). Of course, this is all in the mind of young Ichiro.

Godzilla vs. Gigan
Thought to have been wiped out by Kumonga on Solgell Island, a Kamacuras later turned up on Ogasawara Island, living in peace with the other monsters.

Godzilla Island Series
Aside from Kamacuras' big screen appearences, the monster mantis also made an appearence in the 12th Story Arc of the television show Godzilla Island (1997-1998). In the story, Kamacuras arives on the island under false pretenses, claiming to have escaped from an ever growing "100 Monster Army" being assembled by the Xilian alians. However, Kamacuras is already a part of that army (which consists of only two monsters) and has arived to set a trap for Godzilla and recruit the island's heroic monsters into the evil army. Ultimatly, Kamacuras fails and flees the island, never to be heared from again.

Millennium series
Godzilla: Final Wars
In the 2004 film, Godzilla: Final Wars, Kamacuras made an appearance as one of the many controlled monsters of a race of superior extraterrestrial beings known as the Xilians. It attacks Paris and is soon confronted by the indomitable warship known as the Ecalir; the two proceed to have a heart-racing clash against one another, but soon, the giant manits is teleported away by an enormous UFO to make it seem as if the Xilians eliminated every monster. Eventually, it is discovered that the Xiliens were controlling the the monster, who are returned to finish their rampages. The city of Paris is destroyed by the combined forces of the Xilien ships and Kamacuras. Then, Godzilla is released from his subzero prison and he soon eliminates Gigan in Antarctica, Zilla in Sydney and Kumonga in Arizona. Godzilla soon reaches the shores of Kanto, Japan, where the Xiliens place Kamacuras to battle against the nuclear menace. Ready to do battle from a nearby bridge, the structure is, however, destroyed by the tidal waves advancing in front of Godzilla. The giant mantis quickly flies off, and disguises itself by matching the appearance of the hillside. The King of the Monsters is unfazed by the trick, and nukes the hillside to smoke out the large insect. Kamacuras, left with no other choice, leaps forth, just in time to dodge Godzilla's ray, and readies itself to engage its opponent in close combat. However, Godzilla easily throws the giant mantis away, causing the creature to tumble backwards and fall onto an electrical transmission tower. The tower pierces through the creature's exoskeleton, as its eyes begin to dim and death overtakes it. Godzilla then proceeds to walk away in triumph to face his next challenge.

Powers and abilities
As a giant mantis, Kamacuras has all the natural abilities a normal praying mantis would have, such as flight and spiked claws. In the film Godzilla: Final Wars, Kamacuras is shown with a new deadly ability: the power to alter its natural color, thus allowing Kamacuras to camouflage and blend in with its surroundings, waiting to ambush its unwary opponent.

Filmography
Son of Godzilla
All Monsters Attack
Godzilla vs. Gigan
Godzilla Island
Godzilla: Final Wars

Video Game Appearances
Kaiju-Oh Godzilla
Godzilla Trading Battle

Trivia
The original Kamacuras created by Teisho Arikawa for Son of Godzilla were marionetts opperated by overhead wires (the same effects were also used for the monsters Kumonga and the infant Minilla).  The effects stand out as some of the best in the Showa series.
A videogame called "War Of The Monsters" has a monster named Preytor who clearly resembles Kamacuras.
Kamacuras was considered for Godzilla: Unleashed, but was dropped due to his similarities to the character Preytor in the game War Of The Monsters.