Rita and Zedd change a pet chimp used by Katherine and Aisha for a school project into a Sinister Simian.
Katherine and Aisha help teach a monkey, Kelly, to communicate with sign language for a school assignment. However, Rita Repulsa and Lord Zedd turn the monkey into the Sinister Simian monster to lure the Power Rangers out to fight it. Now, the Rangers have to find a way to defeat the monkey monster without harming it and return the monkey back to normal.—anonymous