Shrink is a small purple experiment with a white lower jaw and chest, three tentacle-like legs, two stubby little arms, and two floppy antennae with two rings. He has the ability to levitate in order to move around.
Shrink can emit a green or pink ray from his eyes that will shrink an object or organism to a very small size. It has also been demonstrated that only the first zap shrinks the object; the second restores its size; and every other enlarges it. He is capable of levitation and/or flight.
Shrink seems to be simple-minded and can easily be manipulated and confused. He can be easily controlled by anyone holding on to his antennae.
Experiment 001 was the first genetic experiment created by Jumba with Hämsterviel's funding. He was designed to change the sizes of objects. When he was created, it is presumed that Jumba and/or Hämsterviel dubbed him Shrink. Right after he was created, it got to the press who posted things about him in the papers. One clip showed a headline of "Idiot Scientist Actually Creates Something!" with Hämsterviel's enlarged bottom in Jumba's face. Eventually, Shrink 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 some point, Shrink was presumably activated, captured, and tamed.
Shrink was seen in a newspaper clip on one of the walls of Jumba's lab along with several other pictures of Jumba and Hämsterviel's early accomplishments. Hämsterviel then tried to convince Jumba to work for him again. However, Jumba refused and pointed out that Hämsterviel had been responsible for getting the former arrested.
Later, the first 624 experiments, including Shrink, 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 Shrink 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.
Shrink made an appearance in the Season 2 episode "Shrink" where Hämsterviel sends him to mess with Jumba and shrink Stitch. He manages to shrink Jumba, Stitch, and Tigerlily. It is revealed that Shrink was abandoned at a young age and has a very willful and childlike behavior following an incident of being locked in a safe when he was younger. He shrinks objects using a green ray from his eyes and has the ability to levitate.
Shrink reappeared in a later episode along with Squeak, Clip, Nosox, and Retro. After Stitch is reverted to his original programming by Retro, he goes on a rampage and ends up falling into a pool along with Shrink's inactive pod. Shrink, seeing that Stitch is drowning, zaps Stitch with his pink ray causing him to grow larger. Eventually, Stitch is turned to good again. Jumba arrives and asks why his experiments are running amok and mentions that Shrink may have been confused after being confined in his pod for a long time, before having Shrink restore Stitch back to his original size.
Shrink also appeared in the special Stitch and the Planet of Sand.
- Shrink originally debuted in Leroy & Stitch; however, he only appeared as a background character and technically was not seen moving until his appearance in Stitch!.
- Shrink is one of the ten known experiments named by someone other than Lilo, the other nine being Gigi, Elastico, Yaarp, Hammerface, Heat, Thresher, Plasmoid, Morpholomew, and Leroy.
- Shrink is one of the few experiments to not appear in the group photo at the end of Leroy & Stitch.
- Shrink's pod color is red in the Stitch! anime.
- In the English dub of the anime episode "Experiment-A-Palooza", Squeak mentions that Shrink can shrink and enlarge things, and that both his and Shrink's names are misnomers.
- In Shrink's first appearance, his size ray is green, but in his second appearance, it is pink.