Experiment 462 was the 462nd genetic experiment created by Jumba with Hämsterviel's funding. He was designed to flatten everything in his path.
462 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 Flat.
Flat is a red Devil-like experiment carrying a pitchfork.