Crossovers

Fictional worlds crossing over.

Henson/Muppet productions

 * Several Muppet characters from previous productions, including Beautiful Day Monster, Scudge and a monster later named Billy, appeared during the first season of Sesame Street.


 * Ernie and Bert make a cameo appearance in the Muppet Show pilot The Muppets Valentine Show, while Bert appears in the pilot The Muppet Show: Sex and Violence.


 * Ernie and Bert appear in episode 102 of The Muppet Show. Bert danced with guest star Connie Stevens.


 * Big Bird makes a guest appearance in episode 318 of The Muppet Show, performing a song with guest star Leslie Uggams and fending off the romantic advances of Gonzo.


 * Ernie, Bert, Cookie Monster, Count Von Count, Grover, and two Anything Muppets appear in Episode 518 of The Muppet Show.


 * Kermit the Frog made numerous prominent appearances on Sesame Street from 1969 to 2001.


 * Big Bird has a cameo appearance in The Muppet Movie; also, several dozens of Sesame Street characters appear in the film's closing shot.


 * Several Sesame Street and Muppet Show characters appear in Here Come the Puppets!.


 * Oscar the Grouch makes "a very brief cameo" in The Great Muppet Caper.


 * Several Sesame Street characters and Uncle Traveling Matt make a cameo appearance at the wedding in The Muppets Take Manhattan.


 * Oscar appears in The Muppets comic strip dated January 5, 1986.


 * Many Sesame Street characters, Sprocket, and Uncle Traveling Matt appear in The Muppets: A Celebration of 30 Years.


 * In episode 111 (Red's Drippy Dilemma) of Fraggle Rock: The Animated Series, a worm collector Fraggle is captured by an animated Big V.


 * Several Sesame Street and Fraggle Rock characters appear in A Muppet Family Christmas.


 * Sprocket and a Doozer appear in The Jim Henson Hour episode "Secrets of the Muppets."


 * Several Sesame Street and Fraggle Rock characters sing "Just One Person" in The Muppets Celebrate Jim Henson.


 * Elmo guest stars in an episode of the series Big Bag.


 * Sprocket and many obscure characters from Fraggle Rock make cameos in both The Muppet Christmas Carol and Muppet Treasure Island.
 * A Sesame Street goat appears in Muppet Treasure Island.


 * A clothed Sprocket and Rowlf the Dog appear in the Dog City special.


 * Sprocket appears in the pet center in Walt Disney World in The Muppets at Walt Disney World.


 * Several obscure characters from Fraggle Rock and The Animal Show make cameo appearances in Muppets Tonight.


 * Sam the Eagle guest stars on an episode of The Animal Show.


 * Sesame Street and Muppet Show characters appear together in I Love Liberty.


 * Sesame Street and Muppet Show characters, and Uncle Traveling Matt from Fraggle Rock appear together in Night of 100 Stars.


 * Elmo made a live appearance in The Muppet Show Live.


 * A Doozer, Junior Gorg and Pa Gorg appear in Muppet RaceMania.


 * Sesame Street, Fraggle Rock and Muppet Show characters in The Television Academy Hall of Fame.


 * Sesame Street, Fraggle Rock and Muppet Show characters in People's Choice Awards.


 * Jill appeared in the "Caribbean Amphibian" sequence of Elmopalooza.


 * A Sesame Street Fish appeared in the fourth season opening of Bear in the Big Blue House.