Experiment 224 was the 224th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to reset important valves and dials to “maximum chaos.”
224 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.
Tweak is a green mouse-like experiment with three short, sharp spines on his back and a long tail with three tiny tentacles at the end.