|Written by||Douglas Sloan|
|Directed by||Terence H. Winkless|
|First aired||November 18, 1995|
|Episode number||Season 3
|Previous episode||Another Brick in the Wall|
|Next episode||Master Vile and the Metallic Armor, Part I|
|Series||Mighty Morphin Power Rangers|
Katherine and Aisha are using Kelly, an adorable chimpanzee, for a class project. Rita and Zedd set their sights on Kelly, and they send Finster down to try to change her into a monster that will destroy the Rangers. Finster is unsuccessful, so Zedd decides he must do it himself. Kelly is then changed into the SINISTER SIMIAN. As Zedd planned, the Rangers are reluctant to fight the creature for fear of hurting Kelly. Billy gets a hair sample from the Sinister Simian in order to analyze and develop a formula to change her back. Rita and Zedd make the creature grow and unleash it on the city. The Rangers call on their Shogunzords and Billy is able to administer the formula through a projectile. Kelly is returned to normal, unharmed. Rita and Zedd’s plans are foiled again.