The Great Muppet Caper (1981)

In this second live-action Muppet film, intrepid journalists Kermit, Fozzie and Gonzo snag an assignment reporting on a British jewel heist. Arriving in England, the trio settles in at the raucous Happiness Hotel and seeks out socialite Lady Holiday (Diana Rigg), the victim of the theft. Soon Miss Piggy appears, intending to work for Lady Holiday, but she ends up getting framed by the aristocrat's scheming brother, Nicky (Charles Grodin). Can Kermit and company clear Piggy's name?