After watching an episode of Crash Nebula, Timmy and friends want to stage an reenactment, and Timmy wants an authentic alien creature for it. To fulfill this want, Cosmo and Wanda conjure up Mark Chang, prince of the planet Yugopotamia. Mark then captures Chester and A.J. 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. / Timmy's teacher, Mr. Denzel Crocker, calls for a conference with Timmy's parents for a suspicious show-and-tell project. Not wanting to let his real parents find out, Timmy asks Cosmo and Wanda to pose as his parents. Crocker, who knows that Cosmo and Wanda are fairies, sets up traps for them to prove their existence.