5x11 - The Muppet Show

Rizzo and the other rats bother Kermit for a spot on the show, so Kermit asks Beauregard to "take care of them." Of course, Bo takes that literally, and treats them as guests. The rats make Beau their president, and manipulate him into giving them food. The rats eventually become so bold that they decide to take over the show. Kermit says Beau has to kick them out, or he goes with them. Beau chooses to stick with his new rat friends, until Miss Piggy enlightens him.