Kevin Clash as Elmo / Baby Natasha (voice)

Bill Barretta as Louie (voice)

Steve Whitmire as Ernie (voice)

Eric Jacobson as Bert (voice)

Dick Maitland as Slimey (voice)

Caroll Spinney as Oscar the Grouch (voice)

Roscoe Orman as Gordon Robinson

Fran Brill as Zoe (voice) (archive footage)

Jerry Nelson as Herry Monster (voice)

Leslie Carrara-Rudolph as Abby Cadabby (voice)

Martin P. Robinson as Telly Monster (voice)

David Rudman as Martian / Baby Bear / Humphrey (voice)

Joey Mazzarino as Cousin Bear (voice)

Carmen Osbahr as Rosita (voice)