Key, A.K.A. Experiment 216, is an illegal genetic experiment created by Jumba Jookiba. He is designed to open any lock with his key-like tail.
Experiment 216 was the 216th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to open any lock with his key-like tail.
216 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
All of the experiment pods were released and scattered across the island of Kauai.
At the unknown point, he was activated, captured, tamed and named Key.