Nub, A.K.A. Experiment 456, is an illegal genetic experiment created by Jumba Jookiba. He is designed to destroy cities.
Experiment 456 was the 456th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to destroy cities.
456 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 Nub.