[Opening title narration
Somewhere out in space live The Herculoids! Zok, the laser-ray dragon! Igoo, the giant rock ape! Tundro, the tremendous! Gloop and Gleep, the formless, fearless wonders! With Zandor, their leader, and his wife, Tara, and son, Dorno, they team up to protect their planet from sinister invaders! All-strong! All-brave! All-heroes! They're The Herculoids!