On the primitive planet of Amzot lives King Zandor and his family whose home is regularly beset by malevolent alien invasions. Fortunately, Zandor's family have the help of their friends, the Herculoids, a cadre of monsters who contribute with powerful abilities of their own. Between their might and Zandor's family's cunning and bravery, the enemies of Amzot don't have a chance.