The Purple Menace

A monstrous purple plant sends forth its tentacles to attack, interrupting a game of hide-and-seek. The Herculoids drive off the branches and destroy the core. Dorno doesn't think the meance is over and he and Gleep go looking for another plant, getting into trouble. Dorno leads them to a crater with an energy rock that is mutating the plantlife. Combining their powers they seal the fissure containing the rock, ending the menace once and for all.