Boomer, A.K.A. Experiment 288, is an illegal genetic experiment created by Jumba Jookiba. He is designed to be a living boomerang. His one true place is with Mrs. Hasagawa as one of her "cats". He is voiced by Rob Paulsen.
He was activated by a watering can. The episode "Mrs. Hasagawa's Cats" also features these experiments: 002 Doubledip: Designed to double-dip, 031 Gotchu: Designed to pinch, 044 Forehead: Designed to sing off-key, 051 Hocker: Designed to spit acid, 077 Zawp: Designed to be lazy, 111 Mulch: Designed to tear up the ground, 134 Shredder: Designed to shred paper, 214 Pix: Designed to take bad pictures, 358 Manners: Designed to turn people polite, 507 Woody: Designed to eat wood, 521 Wrapper: Designed to wrap up things, 533 Blowhard: Designed to blow things, and 566 Derrick: Designed to drill holes.
Boomer is a small white and brown experiment with a red nose, a lightweight body and a curved, boomerang-shaped head with two antennae.
Boomer can use his body as a boomerang.
- Boomer's pod color is yellow.
- Boomer is described by the experiment computer screen as, "Experiment 288. Primary function: Boomerang".