Chief and Rockapella in “Unfinished Business”

This is Wonder Rat.

(singing) Wonder Rat

A crook who travels incognita, nibbling chunks of smooth Velveeta. His last known whereabouts: Kassel, Germany. Once upon a time, there were two brothers named Jacob and Wilhelm Grimm. They wrote and published more than 200 folk tales they had heard from friends and folks around Kassel. Stories like Red Riding Hood, Hansel and Gretel, and Rapunzel. The Grimms wanted to publish the tales before they were forgotten and lost forever. They were first translated into English in the 1820s and have since appeared in dozens of other languages to the enjoyment of readers around the world. At least they were enjoyed until today...

(singing) Oh, no!

...when Wonder Rat pulled a crime for all time in his sleep. He dozed off and in his dreams, he pilfered every page of those classic Grimm tales. When he awoke, the heist was complete and the grim truth is, he's now writing himself into every story. Gumshoes, only you can close the book on today's case...

(singing) Woo-woo-ooo-oo

...TALES YOU LOSE!