Sesame Street Stays Up Late/Dexter's Laboratory

Cast

 * Big Bird as Dexter
 * Grover as Tail Dexter
 * Prairie Dawn as Dee Dee
 * Zoe as Dexter's Mom
 * Count von Count as Dexter's Dad
 * Snuffy as Dexter's Grandpa
 * Oscar the Grouch as Mandark
 * Alfa as Lee Lee
 * Rosita as Mee Mee
 * Elmo as Dexter's Monkey
 * Elmo-noske as Valhallen
 * Slimey the Worm as Mandark's Duck
 * Cookie Monster as Mayor Glory
 * Telly Monster as Krunk
 * Mrs. Grouch as Lalava
 * Baby Bear as Douglas
 * Bert and Ernie in Socks as Mitch and Clem
 * Cousin Pepe as Dextor
 * Bjarne Betjent as Action Hank
 * Tiffy as Pony Puff Princess
 * Max Mekker as Koosalagoopagoop