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.

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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.