A robbery that is apparently carried out by a wolf draws the attention of the Rangers. During a stakeout in the zoo, the Rangers watch one of the wolves, Harry, turn into human form. They follow him on his wild adventures; meanwhile Kirby and Muldoon chase the wolf from another robbery. During a chase, Harry turns back into a wolf and the wolf burglar turns into Professor Nimnul. The Rangers then split up. Chip and Dale discover that Nimnul has created a device, the Metamorphisizer, which switches the physical forms of two animals.
Nimnul uses this to exchange physical forms with Harry the wolf so he can carry out his robberies. Chip and Dale are able to escape from Nimmul with two devices. The other Rangers help Harry escape the pound. They all meet up and through the switching of Metamorphisizers among animals in the zoo, Nimnul and the many zoo animals become mixed-up species. The Rangers manage to unscramble all the animals and Nimnul is taken into custody.
- Corey Burton as Dale, Zipper, Radio Voice, Robbed Man
- Peter Cullen as Monterey Jack, Officer Kirby, Officer Muldoon
- Jim Cummings as Professor Norton Nimnul, Bouncer, Tasmanian Devil
- Tress MacNeille as Chip, Gadget Hackwrench, Harriet, Bunny, Woman at Pound
- Rob Paulsen as Butler, Harry
- This episode's title is a play on the saying "a wolf in sheep's clothing".
Home video releases
- Chip 'n Dale Rescue Rangers: Volume 1