Caroll Spinney
— Big Bird / Oscar the Grouch / Bruno the Trashman (voice)
Jim Henson
— Kermit the Frog / Ernie (voice)
Frank Oz
— Cookie Monster / Bert / Grover / Additional Muppets (voice)
Richard Hunt
— Gladys the Cow / Feathered Friends Owl / Additional Muppets / Grouches (voice)
Kathryn Mullen
— Feathered Friends Magistrate / Grouch Diner Patron / Little Girl / Additional Muppets (voice)
Jerry Nelson
— Count von Count / Herry Monster / Additional Muppets (voice)
Paul Bartel
— Grouch Cook
Sandra Bernhard
— Grouch Waitress
Waylon Jennings
— Truck Driver
Laraine Newman
— Mommy Dodo (voice)
Eddie Deezen
— Donnie Dodo (voice)
Sally Kellerman
— Miss Finch (voice)
Cathy Silvers
— Marie Dodo (voice)
John Candy
— State Trooper
Chevy Chase
— Newscaster
Joe Flaherty
— Sid Sleaze
Dave Thomas
— Sam Sleaze
Brian Hohlfeld
— Daddy Dodo (voice)
Linda Bove
— Linda
Emilio Delgado
— Luis
Loretta Long
— Susan
Sonia Manzano
— Maria
Bob McGrath
— Bob
Roscoe Orman
— Gordon
Alaina Reed Hall
— Olivia
Kermit Love
— Willy
Alyson Court
— Ruthie
Richard Campbell
— Boy with Apple
Liston Bates
— Rescue Boy
Tawny Richard
— Rescue Girl