to the adults' confusion. Back in the studio, David hires Biff to use a jackhammer to make the door unstuck, but it goes out of control. Elmo then introduces the next song: Gloria Estefan singing "Mambo I, I, I" with Rosita, Maria, Luis, and the Oinker Sisters. Elmo gets Telly to be a comical doctor. Telly nervously "checks up" on Elmo, who ends up laughing when he's tickled. David tells him to introduce the next song: The Count and The Mighty Mighty Bosstones singing "Zig Zag Dance". Big Bird brings in Richard Belzer to help get the door unstuck, but he needs help from his stuntman Sparky, who runs to the door and hits it with his head, but still no success. Then, Shawn Colvin and Ernie sing "I Don't Want To Live On The Moon." Jon Stewart tries digging his way out of the studio, as Chris Rock enters the picture. He tries to get them out, but what he didn't know was that the door is stuck. After an insult from Oscar, he decides to fill in on hosting duty. But when Prairie insists that he cannot tell any dirty jokes, he instead decides to go back to his seat, leaving Oscar interested in his mud jokes. Meanwhile, Grover's limo ends up lost in Roswell, New Mexico, leaving the adults unhappy, when a UFO appears in front of them and a Martian joins in the carpool, much to their surprise. Then, En Vogue, Cookie Monster, Zoe, Frazzle, and the Two-Headed Monster perform "I Want A Monster To Be My Friend." Backstage, as Elmo checks the script, he realizes that he doesn't know how to read. David comes to tell Elmo that the tape machine is malfunctioning so they can't do the next song. Elmo then decides that he's going to sing a song that will bring down the house. He calls in the big cheese, Rosie O'Donnell, and asks her if she wants to sing with Elmo. Rosie accepts and they both head to the stage, singing "Nearly Missed", with a prop rainbow, sun, and shooting star displaying. As they finish, Rosie accidentally knocks Elmo backstage, creating a mess on the stage. Elmo decides to surrender. Then, Kermit the Frog and Jimmy Buffett sing "Caribbean Amphibian". Elmo, thinking he has ruined the show, walks away from the studio as Big Bird tells him he can't give up and