Chief and Rockapella in “Unfinished Business”

And this is Wonder Rat, that self-promoting snivler who steals stuff for Carmen Sandiego.

(singing) Wonder Rat

His last known whereabouts: Germany's Rhine River. On a small island in the Rhine stands a 700-year-old Mäuseturm, or Mouse Tower. According to legend, an evil bishop invited a crowd of starving peasants into his bond, promising them free food. Then he burned down the barn with the peasants inside. The next morning, 10,000 mice chased the bishop out of his castle and into the tower where they ate him alive. I love happy endings. Now the tower is a popular tourist spot. Or it was until today when that caped crudhead Wonder Rat scoped up the tower while rowing up the Rhine. He backed up and bopped off with it. Gumshoes, you've got to retrieve the tower, catch Carmen, and stop this game of...

(singing) Woo-woo-ooo-oo

...RAT AND MOUSE!