Serum, A.K.A. Experiment 330, is an illegal genetic experiment created by Jumba Jookiba. He is designed to give people love potion #9.
Experiment 330 was the 330th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to give people love potion #9.
330 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 an unknown point, 330 was activated, captured and named Serum.
Serum is a dark brown experiment with a dark brown tail, a belly with a lighter color, a Millie (220)-like head with a gray nose, and a white lab coat.