Experiment 557 was the 557th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to create soup and other liquid food.
557 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 Cauldron.
Cauldron is a dark red koala-like experiment with a bowl-shaped head.
He uses tail as if were a nun-chuck (tail is detachable). Lilo and Frenchfry learn that brussel sprouts are his one weakness so they buy some brussel sprouts and put it in Cauldron's bowl-like body which makes his last spell worthless.
His one weakness is brusselsprouts.