Psycho, voiced by Charles Fleischer, is the most mentally unstable of the group of weasels. He has a shrilling laugh and high-pitched voice. Psycho wears an unbuckled "Canadian Long Jacket" straitjacket, has an unnaturally white muzzle, blue eyes with yellow and white swirls characterizing his insanity, and unkempt fur by the hairline, giving it a spiky appearance. His weapon of choice is a barbershop straight razor. He is the last weasel to die as a result of laughing to the point of losing his footing, and falls into the giant rotating brush of the Dip Machine. However, even in death he proves to be dangerous as his ascending spirit pulls a lever on the Dip Machine, making the dip stream change it's course and home in on the tied-up Roger and Jessica.

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