The Monkees S01 E18 I Was a Teenage Monster

"Who's putting who on? You'll never know till you see this show!"

A mad scientist (John Hoyt) hires the Monkees to teach his monster (Richard Kiel) music—and then transplants their musical talent into the monster. Can the Monkees get their talent back? Byron Foulger appears as Groot, Dr. Mendoza's assistant.