Derrick

Derrick, A.K.A. Experiment 566, is an illegal genetic experiment created by Jumba Jookiba. He is designed to drill potholes. His one true place is with Mrs. Hasagawa as one of her "cats." Derrick is voiced by Jeff Bennett.

Lilo & Stitch: The Series
Experiment 566 was the 566th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to drill potholes in the floor. 566 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. Against statistically unlikely (but not impossible) odds, several experiment pods landed in one location: Mrs. Hasagawa's yard, 566's pod being one of them.

At an unknown point, Mrs. Hasagawa mistook 566's pod for an apricot and washed it, activating the experiment. However, as 566 was not a very evil or destructive experiment, he was able to live a peaceful life with her, due to the latter seeing the former as a mere stray cat who needed a home, though he frequently drilled holes in her floor due to not being rehabilitated.

When Lilo and Stitch discovered that Mrs. Hasagawa kept several experiments as pets, they thought they were a danger to her and along with Jumba and Pleakley, tried to capture them all. 566 was then captured in a container by unknown means.

566 and the other experiments were about to be taken away, but were returned to Mrs. Hasagawa when Lilo and Stitch saw how much she cared for them. 566 was then named Derrick.

Leroy & Stitch
The first 624 experiments, including Derrick, 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 Derrick 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.

Trivia

 * Derrick's pod color is blue.
 * Derrick is described by the experiment computer screen as, "Experiment 566 Primary function: Driller."