Jim Henson
Kermit the Frog / Rowlf the Dog / Dr. Teeth / Swedish Chef / Waldorf / Ernie / Self

Frank Oz
Miss Piggy / Fozzy Bear / Animal / Sam the Eagle / Bert / Grover / Cookie Monster

Dave Goelz
Gonzo / Dr. Bunsen Honeydew / Zoot / Beauregard / Boober Fraggle

Jerry Nelson
Robin the Frog / Camilla the Chicken / Floyd Pepper / Lew Zealand / Pops / The Count / Gobo Fraggle / Herry Monster

Richard Hunt
Scooter / Janice / Statler / Beaker / Gladys the Cow / Two-Headed Monster / Snowman (voice)

Kathryn Mullen
Mokey Fraggle (voice)

Steve Whitmire
Turkey / Rizzo the Rat / Wembley Fraggle / Sprocket the Dog / Lips (voice)

Caroll Spinney
Big Bird / Oscar the Grouch (voice)

Karen Prell
Red Fraggle / Maureen the Mink (voice)

David Rudman
Miss Piggy's Photographer (voice)

Gerard Parkes
Doc

Terry Angus
Additional Muppet Performer (uncredited)

Debra Spinney
Additional Muppet Performer (uncredited)

Fred Stinson
Additional Muppet Performer (uncredited)

Bob Stutt
Additional Muppet Performer (uncredited)