The Hydra's name stems from the Greek work hydros, meaning water-snake, as the Hydra in the Heracles myth from which it originates is partially aquatic.
The Hydra is orange in color with three clawed toes on each of its two feet. It has a frill on the backs of its heads, and small green eyes with purple eyelids on either side of them. It stands on two legs, has no arms, and has a fan-like fin on its tail.
After Godzilla appeared in ancient Greece, the god Poseidon was sent to defeat him. He was ultimately unsuccessful, and Godzilla reached Olympus in a tidal wave. Zeus, the king of Olympus, then called for the Hydra to defend Olympus. The Hydra quickly bit Godzilla's arm, which prompted it to tear off the Hydra's head. While Hydra's two new heads were growing in, Godzilla blasted them with his Atomic Ray, causing four heads to reform. Zeus then sent a lightning bolt at Godzilla, allowing the heads to mature completely, but at that point, Godzilla learned from his mistakes, bit into one of the Hydra's necks and tore flesh from its back, and tackled the Hydra into Mount Olympus. The mountain then crumbled on top of the Hydra and killed it.
The Hydra has the uncanny ability to regrow two heads whenever one is cut off.
- The Hydra was one of the many mythological inspirations for King Ghidorah. Within the continuity of the Monsterverse, it is believed by Monarch that King Ghidorah was the basis for the mythical Hydra.
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