Hundreds of celebrities have appeared as themselves on Sesame Street, but plenty of popular fictional characters have made cameos as well. Here are some of our favorites, from R2-D2 to GOB Bluth (well, kind of).
1. C-3PO & R2-D2
Back in 1980, Big Bird saw a flying saucer touch down, but none of the adults believed him. Naturally, once their backs are turned, C-3PO and R2-D2 strolled on by. They'd come to Sesame Street to deliver a holographic message to Oscar from Lothar the Grouch. The important message: "Get Lost!" The droids stuck around for two episodes, playing games and singing songs. And then R2-D2 fell in love with a fire hydrant.
2. Superman & Batman
In the first season of Sesame Street, both Superman and Batman appeared in short cartoons produced by Filmation. In one clip, Batman told Bert and Ernie to stop arguing and take turns choosing what's on TV. In another, Superman battled a giant chimp. Batman and Robin took a break from chasing the Joker to talk about safely crossing the street safely, and Superman explained why S is his favorite letter.
3. Wayne Campbell
In 1995, Telly and Big Bird hosted their own cable access show, Telly's Town, a parody of Saturday Night Live's "Wayne's World." While presenting music videos, they received several telegrams, which were delivered by Wayne Campbell himself. Before each one, Wayne became teary eyed at the beauty of the act of reading, and the episode culminates with Wayne, Telly, Slimey the worm, and a monster playing the Sesame Street theme song on tubas. No, really.
4. The Wicked Witch of the West
5. Richie, The Fonz & the Cast of Bonanza
6. Several Laugh-In Characters
7. A Bunch of SCTV Characters, Too
8. Luxo & Luxo, Jr.
9. Max the Magician (But Really GOB Bluth)
And we'll end with Will Arnett's Max the Magician, who appeared on Sesame Street in 2008 and was remarkably similar to the character he played on Arrested Development, GOB Bluth. Love his theme music.