After watching an episode of Crash Nebula, Timmy and his friends decide to act out their own version of the episode. Timmy figures the reenactment will be more realisitic with an authentic alien creature. To fulfill this want, Cosmo and Wanda conjure up Mark Chang, prince of the planet Yugopotamia. Mark then captures Chester and A.J. (neither of whom know he is a real alien) and develops an affection for Vicky. Since magic cannot interfere with true love, Timmy, Cosmo and Wanda blast off to Yugopotamia to find Mark's parents so they can set things straight and bring Mark home.