After killing two creatures with a treasure chest, pirates bury it on Amzot when the Herculoids approach; Dorno is captured and held hostage. Sarko the Arkman comes to Quasar to capture specimens and grabs Igoo. The others come running and Sarko gasses Zandor then captures Dorno and Tundro but Gleep escapes to warn the remainder. Tara wakes up Zandor and Zok, Gleep, and Zok head off into space to track down Sarko. Zok frees the captives while Zandor draws Sarko's fire. They beat up Sarko and keep him from dropping Dorno to his death.