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Steve Whitmire
Ernie / Mo / Troll / Frosty Four Leader (voice)

Eric Jacobson
Bert / Grover (voice)

Fran Brill
Prairie Dawn / Zoe / Frosty Four Singer (voice)

Kevin Clash
Benny Rabbit / Elmo / Frosty Four Singer (voice)

Carmen Osbahr
Rosita (voice)

Stephanie D'Abruzzo
Flo / Frosty Four Singer (voice)

David Rudman
Cookie Monster (voice)

Jim Henson
Kermit the Frog / Bip Bippadotta / Lavender Anything Muppet in Fat Cat (voice) (archive footage)

Louise Gold
Chicken (voice)

Caroll Spinney
Oscar the Grouch (voice) (archive footage)

Frank Oz
Bert / Cookie Monster (credit song) / T-Shirt Salesman / Fat Blue Anything Muppet in Fat Cat (voice) (archive footage)

Jerry Nelson
Kermit the Forg / Kermit the Gorf / Kermit the Grof / Green Anything Muppet in Fat Cat (voice) (archive footage)

Richard Hunt
Harry (voice) (archive footage)

Ivy Austin
Bookworms Leader (voice) (archive footage)