|First Appearance||The War of the Gargantuas (1966)|
|Other Appearances||Godzilla vs. Gigan (stock footage); Godzilla vs. Megalon (stock footage); Godzilla Against Mechagodzilla (stock footage); Godzilla: Final Wars (stock footage)|
Gaira is a Toho kaiju who first appeared in the 1967 film The War of the Gargantuas. Gaira is actually the "son" of the monster Frankenstein, as he was created from the latter's cells. Gaira also has a similar, but brown-haired, brother called Sanda.
Gaira, the Green Gargantua, emerged almost a year after Frankenstein’s battle with Baragon, supposedly growing from pieces of the human-like monster’s flesh that had washed out to sea. Unlike his “brother” Sanda, the Brown Gargantua, Gaira was a vicious kaiju that actually fed upon human flesh. However, Gaira dwelled in the sea, where humans were in short supply, so Gaira soon began to attack ships and devouring the crews. He later turned to attacking cities along Japan’s coast, but disliking the sun, attacked only when it was cloudy, retreating to the sea whenever the sun emerged. Tired of the Green Gargantua's attacks on their country, the JSDF decided to lure Gaira into a trap, nearly killing the monster with an electrified lake and Maser Cannons. However, Sanda, the Brown Gargantua, surprisingly arrived and saved Gaira, but when the human-liking Sanda discovered that Gaira had been eating humans as his main diet, the Brown Gargantua attacked him, forcing the Green Gargantua to retreat to Tokyo. Now in Tokyo, Gaira began to attack the city, but Sanda soon arrived and the two engaged in a fierce battle in the city streets. The battle eventually moved out to the sea, where a volcano engulfed both Gargantuas.
Gaira makes brief appearances in the Millennium era films Godzilla Against Mechagodzilla and Godzilla: Final Wars. In the former film, Japan's prime minister recounts the different attacks by giant monsters on Japan, and Gaira is one of those monsters. In the latter film, Earth's anti-kaiju force narrates the emergence and defeat of several monsters throughout history, with Gaira being one of the monsters.Gaira also made an appearance in the television series Go! Greenman. The design is more dark colored and spiky than the original, and the creature.
- Gaira is able to grow back body parts.
- Gaira's severed cell tissue can take on a life of its own.
- Gaira, like Sanda, also has a new head and wig.