From Muppet Wiki
Elmopalooza aired on ABC on February 20, 1998.
In this special, Jon Stewart plans to host a music special to celebrate Sesame Street’s 30th anniversary. Jon and the show's crew, including producer Prairie Dawn, are in a dressing room getting ready for the show. Elmo visits them before the show starts and then leaves, shutting the door before Jon can tell him that the door is broken: it won't open once it's shut. Elmo decides to host the show, and the rest of the Sesame Street cast work behind-the-scenes, presenting music video remakes of classic Sesame Street songs.
Meanwhile, Grover drives Susan, Gordon, Gina, Bob, and Mr. Handford in a limo to the studio, but Grover gets lost and they end up in Roswell, New Mexico.
A soundtrack album was also released on cassette and CD, and the special was released on VHS two months after the special aired on TV. 
- Elmo, Big Bird, Oscar the Grouch, Zoe, Prairie Dawn, Bert, Ernie, Count von Count, Grover, Cookie Monster, Slimey, Mr. Snuffleupagus, Martians, Two Headed Monster, Rosita, Biff, Kermit the Frog, Baby Bear, The Elephant, Sparky
- Roxie Marie, Forgetful Jones, Herry Monster, Frazzle, Sully, Mama Bear, Papa Bear, Granny Bird
Celebrity Guest Stars
- Jon Stewart, David Alan Grier, Rosie O'Donnell, The Fugees, The Mighty Mighty Bosstones, En Vogue, Shawn Colvin, Kenny Loggins, Gloria Estefan, Cindy Crawford, Tyra Banks, Chris Rock, Don Henley, Conan O'Brien, Richard Belzer, Will Smith (archive footage), Jada Pinkett Smith (archive footage), Tony Bennett (archive footage), Madonna (archive footage)
Sesame Street Humans
- Susan, Gordon, Bob, Mr. Handford, Gina, Luis, Maria, Ruthie
- ↑ The Amazon.com page lists the release date as April 14, 1998.