Gigan (ガイガン, 'Gaigan') is a Kaiju from the Godzilla series, introduced in the 1972 film Godzilla vs. Gigan. Gigan is a monster sporting a buzzsaw weapon in his frontal abdominal region and large steel hooks for hands and feet. Gigan is sometimes considered Godzilla's most brutal and violent opponent, and has a large fan following (including Godzilla: Final Wars director Ryuhei Kitamura) despite the generally perceived low quality of its first two films.
Gigan is revived by Destonator and assigned to take care of Godzilla and Mothra, with a pure evil energy boost, and his wings able to fly again. He meets with the heroes, and creates an arena-like area for the three monsters to fight. It appears Mothra and Godzilla are losing, but just when Gigan was about to deliver the final blow, Mothra Leo tackled him! Gigan fired a Shotgun burst at it, but misses, and Leo disables his wings. Gigan begins to fight all crazy with his scythes, with Leo dodging. Gigan gets exhausted, and Leo knocks him down, and the pure evil given to Gigan by Destonator fades away. Leo heals Mothra, Godzilla and Gigan. Left with no other choice, Gigan joins the Heroes and sets off an earthquake that takes down the arena's walls.