Skip

Skip, A.K.A. Experiment 089, is an illegal genetic experiment created by Jumba Jookiba. He skips a person's life by ten years when they press the button on his head.

Bio
Experiment 089 was the 89th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to skip time by ten seconds (because Jumba was too lazy to wait for his leftovers to re-heat), but instead, when the button on 089's head is pressed, he skips ten years of a person's life.

089 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.

Lilo & Stitch: The Series
At an unknown point, Experiment 089 was activated and taken in by the dog shelter.

In "Skip," 089 was adopted from the dog shelter by Lilo and named Skip.

Lilo, tired of childhood restrictions, used Skip to skip ten years and become a teenager.

When Lilo found that teenage life was a lot more difficult than childhood, she used Skip to skip another ten years, sending Lilo, Stitch and Skip into an alternate future ruled by Hämsterviel.

Stitch and Skip were shortly after captured by Clink and taken to Gantu.

However, Stitch and Skip were rescued by Lilo, Jumba and Pleakley. Lilo then used Skip's reverse setting to return her and Stitch to the present. Additionally, Lilo realized that being a child had its advantages.

Leroy & Stitch
The first 624 experiments, including Skip, were round 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.

Skip did not participate in the following battle between the experiments and the Leroy clones, instead choosing to retreat with the weaker experiments.

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 failsafe.