Rattat, A.K.A. Experiment 257, is an illegal genetic experiment created by Jumba Jookiba. He is designed to turn his victims into dogs.
Experiment 257 was the 257th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to turn his victims into dogs.
257 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 the unknown point, he was activated, captured, tamed and named Rattat.
Rattat is a red horse-like experiment with a fairly long, brown dog-like tail.