Elmo's Christmas Countdown/Dexter's Laboratory

Cast

 * Elmo as Dexter
 * Big Bird as Tall Dexter
 * Abby Cadabby as Dee Dee
 * Mama Bear as Dexter's Mom
 * Papa Bear as Dexter's Dad
 * Snuffy as Dexter's Grandpa
 * Oscar the Grouch as Mandark
 * Prairie Dawn as Lee Lee
 * Zoe as Mee Mee
 * Jamie Fox as Dexter's Monkey
 * Count von Count as Valhallen
 * The Mouse King as Mandark's Duck
 * Grover as Mayor Glory
 * Cookie Monster as Krunk
 * Baby Bear as Douglas
 * Bert and Ernie as Mitch and Clem
 * Telly Monster as Dextor
 * Hoots the Owl as Action Hank
 * Rosita as Pony Puff Princess
 * Herry Monster as Koosalagoopagoop