Cooler, A.K.A. Experiment 500, is an illegal genetic experiment created by Jumba Jookiba. He was designed to lower temperatures below freezing. (does so by opening the cork atop his head and letting out cold air). But Jumba failed because he was only able to lower temperatures to zero degrees exactly. His one true place is at an ice skating rink.
Experiment 500 was the 500th genetic experiment created by Jumba with Hämsterviel's funding. He was originally designed to lower temperatures below freezing, but because of a glitch, he can only lower temperatures to zero degrees exactly.
500 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, 500 was activated, captured, and named Cooler.
The first 624 experiments, including Cooler, were rounded up by Leroy and taken to a stadium to be destroyed. However, Lilo, Stitch, Jumba, Pleakley, Reuben and Gantu arrived before the experiments could be destroyed.
It is unknown whether or not Cooler participated in the following battle between the experiments and the Leroy clones.
The Leroys soon gained the upper hand in the battle, but were defeated when Lilo, Stitch, Reuben and several other experiments performed the song "Aloha ʻOe", which caused the Leroy army to shut down due to the original Leroy's fail-safe.
Cooler is a large, plump blue experiment, roughly in the shape of a triangle. He has a large mouth lower on his face, with his black eyes and his orange nose directly above. His ears are at the point of his triangular figure, with an orange cork shape in between.
Cooler can decrease the temperature around him by 10 degrees, by unknown means.
- Cooler's pod color is blue.