Inhumanoids(1986)

Inhumanoids is a 1986 animated series following Earth Corps, a team of scientists who battle three monstrous creatures dwelling beneath the planet's surface. The Inhumanoids—powerful subterranean beings—threaten civilization, forcing the heroes to call upon the Mutores, elemental allies with extraordinary powers. Produced by Sunbow and Marvel Productions with animation by Toei Animation, the show combines action and adventure in the tradition of classic Hasbro properties. Earth Corps must use both intellect and their mystical companions to stop the monsters from destroying the world above. The series blends sci-fi and fantasy elements into an engaging battle between surface dwellers and underground threats.