Sesame Street Stays Up Late/Captain Underpants

Cast

 * Telly Monster as George
 * Elmo as Harold
 * Grover as Captain Underpants
 * Max Mekker as Melvin Sneedly
 * Cookie Monster as Mr. Krupp
 * Uncle Hank as Professor Poopypants
 * Benny Rabbit as Dr. Diaper
 * Mrs. Grouch as Mrs. Ribble
 * Ernestine the Telephone Operator as Mrs. Anthrope
 * Hoots the Owl as Tim Bronski
 * Baby Bear as Stevie Loopner
 * Zoe as Jessica Gordon
 * The Big Bad Wolf as Mr. Fyde
 * Prairie Dawn as Stephanie Yarkoff
 * Mr. Grouch as The Bionic Booger Boy
 * Uncle Fred as Mr. Rustworthy