Experiment 202 was the 202nd genetic experiment created by Jumba with Hämsterviel's funding. He was designed to jam radar with his high-pitched shriek. 202 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, with 202's pod landing on a cliff face by a waterfall.
Later, 202's pod was accidentally moved by a frog off the ledge and into the waterfall, activating the experiment, which then flew off to cause trouble.
At an unknown point after this, Experiment 202 was presumably captured and named Jam.
After activation, he flew through the cities, jamming TV signals and radio towers. After being captured by Stitch, it was discovered that not only did Keoni love bats, but Jam had an attraction to Keoni because his father worked in several businesses.
The first 624 experiments, including Jam, 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.
Jam 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.
Jam is a purple bat/lizard-like experiment with four arms, a lion-like tail, large wings on his shoulders and a Stitch-like face.
Jam's screech is expelled in multiple frequencies which can interfere with radio and radar frequencies, therefore "jamming" them.
- Jam is Experiment 202. However, in Stitch! The Movie, his pod is mislabeled 455, most likely due to Jumba's untidy database.
- Jam's pod color is red.
- Jam is described by the experiment computer screen as, "Experiment 202. Primary function: Jamming radar".
- Jam's wings appear in the game Jumba's Lab.