Cloudy, A.K.A. Experiment 320, is an illegal genetic experiment created by Jumba Jookiba. He is designed to depress others with constant rain. His one true place is raining on Mrs. Hasagawa's fruit, suggesting he may be one of her "cats."
Cloudy is a gray cloud-like experiment with small black eyes, a thin, wavy mouth and dark gray markings on his body.
320 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, he was activated, captured and named Cloudy.
Later, the first 624 experiments, including Cloudy, 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 Cloudy 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 `Oe," which caused the Leroy army to shut down due to the original Leroy's fail-safe.
- Cloudy's pod colour is white.