Mother Legion is the primary antagonist in the film 'Gamera 2: Attack of Legion' from the Gamera series. She is a massive, insect-like extraterrestrial kaiju leading the Legion swarm that invades Earth. Possessing immense power, intelligence, and destructive capabilities, Mother Legion is a formidable foe for Gamera. Her role in the series is to threaten humanity and challenge Gamera with her overwhelming strength, advanced weaponry, and the ability to command smaller Legion soldiers, making her one of the most memorable threats Gamera has ever faced.