A family of Adventurers: Zandor, Tara and Dorno are constantly having to defend their home planet of Amzot from Alien Invaders. Luckily for Zandor and his family they have the help of a band of unique creatures called the Herculoids to aid them in their struggles: Gloop, Gleep (two protoplasmic creatures), Zok (a laser shooting dragon), Igoo (a stone ape), and Tundro (a giant armadillo like creature).