Thanks to Angel Grove High's "teacher for a day" project, Rocky trades places with strict science teacher Mr. Wilton. With each one of them out of their element, can the atypical pair find common ground? Inspired by this role reversal, Rito is given the title of "Emperor of Evil" for a day by Zedd & Rita, and aims to turn one of the Rangers into a monster. But instead, Mr Wilton is struck and transformed into the chemical wizard, Marvo the Meanie! Can Rocky save his teacher and stop the monster at the same time? Meanwhile, the ever-alert Juior Police Officers, Bulk & Skull, spot Rocky with teacher's editions textbooks and set out to bust him for cheating!