My son and I are going through all of the old Muppet Show episodes. We recently did the Star Wars episode where Mark Hamill, C-3PO, R2-D2 and Chewbacca are guest stars. It's one of the best episodes the Muppets ever did. Interesting this episode came out before The Empire Strikes Back but Hamill is wearing his Bespin outfit. There is also a bit of foreshadowing when the Muppets and Star Wars gang are sing "When you wish upon a star" while standing in front of a Magic Kingdom-like castle.