Dale Beside Himself (S01E03)

At the end of their vacation, three shape-changing aliens, Bric, Brac and Dtz, have to leave Earth but Dtz sneaks off and stays behind. When science fiction fan Dale meets Dtz, he convinces the alien to take his shape. Soon Dale has Dtz doing all his chores, and the rest of Rangers are shocked at sloppy Dale's new behavior. Bric and Brac demand that Dtz return home, but Dtz sends Dale in his place. Bric and Brac, worried that Dtz (actually Dale) is becoming too Earthlike, decide to freeze him and take him home to Reeblebrox for treatment. Dale escapes only to find he has to prove he's the real Dale. (iTunes)