Jay, A.K.A. Experiment 410, is an illegal genetic experiment created by Jumba Jookiba. He is designed to sink naval ships (does so by using his sharp spear-like appendage to easily slice through ship hulls).
Experiment 410 was the 410th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to sink naval ships.
410 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.