Doc, Zak and Fiskerton strike a bargain with the Secret Scientists. If the Saturdays can subdue a huge, wild cryptid that's gotten loose in Dr. Beeman's Peruvian lab, the Scientists agree to call off their pursuit of Zak for six months. Unfortunately, the shape-shifting Revolving Beast seems to be immune to Zak's powers, and in a moment of desperation, Zak secretly turns to Argost for help. Seizing the moment, Argost springs his final trap, putting Zak's life and the entire world in jeopardy.