PJ, A.K.A. Experiment 133, is an illegal genetic experiment created by Jumba Jookiba. He is designed to play practical jokes on people. His one true place is performing an opening act for Moses' hula gig.
Experiment 133 was the 133rd genetic experiment created by Jumba with Hämsterviel's funding. He was designed to play practical jokes on unsuspecting victims, hence his name P(ractical) J(oker). 133 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.
133, named PJ (for Practical Joker), then proceeded to start playing jokes on everyone he could find. Eventually, he ran into Lilo and Stitch. When PJ pulled many pranks on Stitch, the latter then tried to beat him up, only to be stopped by Lilo.
After that, PJ relentlessly pranked Lilo's strict substitute teacher for her hula class, while framing Lilo for it. However, PJ was eventually put in a containment orb so that he wouldn't cause further chaos.
Later, Lilo wanted to play a huge prank on her substitute teacher. She then used Drowsy to put Stitch to sleep so the latter wouldn't interfere while Lilo freed PJ from containment for his help. However, Stitch later woke up on his own and triggered a booby trap set up by PJ in which Stitch got stuck inside PJ's containment orb.The next morning, Stitch was freed from containment by Pleakley. The former then raced to Lilo's hula school and tried to prevent Lilo and PJ from executing their prank.
Meanwhile, PJ prepared to pull a really big prank on Lilo's substitute teacher, which ended up backfiring (due to Stitch intervening) and made PJ literally get his butt kicked (several times actually). Luckily, PJ was freed from his own contraption by a sympathetic Stitch.
Shortly after, PJ was found a one true place as an opening act performer for Moses' hula gig.
The first 624 experiments, including PJ, 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.
PJ 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 Oe", which caused the Leroy army to shut down due to the original Leroy's fail-safe. PJ joins them for the song by playing the trumpet.
PJ is an orange and tan koala-like experiment with a white face and white belly, a wide mouth, red nose, black eyes, two thin yellow-tipped antennae on his head resembling rabbit-like ears, and a functioning blow-horn for a tail (reminiscent of Harpo Marx's trademark horn), which he squeaks instead of speaking. He wears joke eyeglasses with a fake nose and mustache resembling those of Groucho Marx.
PJ is a skilled practical joker. He can play practical jokes by using his surroundings as well as other things he finds.
PJ has shown to be skilled in playing the trumpet.
- PJ's pod color is white.
- PJ is described by the experiment computer screen as, "Experiment 133 Primary function: Farceur abilities".
- In the group photo taken at the end of Leroy & Stitch and the Disney.com Lilo and Stitch experiment gallery, PJ is not wearing his glasses. It is possible that the glasses got broken during battle.