Yang

Yang, A.K.A. Experiment 502, is an illegal genetic experiment created by Jumba Jookiba. He is designed to attack by spouting balls of lava. His one true place is creating a new island with Yin (501).Yang is voiced by Frank Welker.

Bio
Experiment 502 was the 502nd genetic experiment created by Jumba with Hämsterviel's funding. He was designed to spout lava from his back.

502 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 502's pod landing in a crack in the ground in a mountain road.

Lilo & Stitch: The Series
When a passing man poured water into his jeep's burnt-out engine, the water flowed out, into the crack and onto 502's pod, activating him. 502 then erupted to the surface and set out.

While crossing a road in front of a jeep, when the jeep's driver scolded 502 to get out of the way, the angered experiment destroyed the jeep.

502 later entered Kokaua Town and went on a rampage, destroying everything in sight. Stitch jumped onto one of 502's back spouts to try and stop the latter, but 502 simply blasted him off and most likely continued his rampage.

Later, while 502 was scratching himself, he was ambushed by Gantu and trapped in a net. However, 502 was able to escape by simply using his lava to melt through the net.

502 was chased by Jumba and Stitch through a jungle, but the two failed to capture the former. Experiments 501 and 502 then met for the first time. However, they were ambushed and captured by Gantu before they could make physical contact.

While returning to his ship with the two captured experiments, Gantu fell for a trap laid by Reuben, allowing 501 and 502 to escape.

When Lilo later tracked 502 down, the latter attacked Lilo with fireballs. However, Lilo was able to block off 502's attacks long enough for Stitch to immobilize 502 via anti-heat foam.

Yin and Yang reappeared in "Elastico".

In "Houdini", Yang was one of the audience for Stitch's magic act.

In "Finder", Yang was seen playing poker with Stitch, Cannonball, Richter and Yin (501).

In "Dupe", Yang was one of the experiments who came to Lilo and Stitch's slumber party, wearing short and bunny slippers. However, he was forced by Pleakley to leave due to his destructive behavior.

In "Angel", Yang was one of the experiments who Angel reverted to evil using her song. Yang and the other rehabilitated experiments attacked Stitch aboard a ship, but Angel turned them back to good before they could finish Stitch off. Working together, the experiments were then able to successfully escape the ship.

Yin reappeared in "Slugger".

In "Ace", when the CEO of EGO arrived on Earth to decide whether or not Jumba was still evil, Yin and Yang posed as mutant creations as part of a hoax to fool the CEO.