BooGoo is a mysterious creature from outer space in the Stitch! anime. Although a self-centered indulgence, he is a pet that is loved by everyone present on the island. He often accompanies Yuna, Stitch, Jumba and Pleakley on certain missions throughout the anime series.
In one episode, Experiment 303 (Amnesio) zaps the memories of BooGoo, Stitch, Jumba, Gantu, Reuben and Hämsterviel. Everyone's memory is shown to be stored in capsules under Amnesio's wings. When Amnesio is eventually captured, Gantu demands him to give up the memory-containing capsules. Near the end of the episode, it is shown that the capsule Gantu had swallowed didn't contain his own personality – it contained BooGoo's! Likewise, on Earth, Gantu finds himself in BooGoo's body and demands to be put back to normal.