Patter, A.K.A. Experiment 415, is an illegal genetic experiment created by Jumba Jookiba. She is designed to eat single socks from each pair (does so by eating a single sock from each pair that she finds; she can even eat sock that is being worn without the wearer even noticing). Her one true place is at a clothing factory.
Experiment 415 was the 415th genetic experiment created by Jumba with Hämsterviel's funding. She was designed to eat single socks from each pair. 415 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.
Possibly at an unknown point, 415 was activated, captured, and named Patter.
The first 624 experiments, including Patter, 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 Patter 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.
- Patter's pod color is red.