SPF, A.K.A. Experiment 528, is an illegal genetic experiment created by Jumba Jookiba. He is designed to block out all sun light on planets, causing all sorts of problems, when turned to good he can block out harmful sun light, leading to his one true place, fixing the Ozone. His one true place is as a collapsible party tent.
Experiment 528 was the 528th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to block out all sun light on planets, causing all sorts of problems.
528 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 SPF.
SPF is a yellow flying squirrel-like experiment with a flat, rubbery body.
- SPF is described by the experiment computer screen that says "Experiment 528 Primary function: Inhibits stellar radiation".