Cast and credits of Grundgetta's birthday

Paul Benedict
The Mad Painter

Linda Bove
Linda

Emilio Delgado
Luis

Suzanne Farrell
Self

Jim Henson
Ernie / Kermit the Frog / Guy Smiley / Nose / Doc / Fat Blue Victim (voice)

Richard Hunt
Pumpkin Cowboy (voice)

Will Lee
Mr. Hooper

Loretta Long
Susan

Sonia Manzano
Maria

Bob McGrath
Bob

Brian Muehl
Grundgetta / Barkley (voice) (as Brian Muehl)

Jerry Nelson
The Count / Herry Monster / Mean Manny / Lavender Customer / Bartender / Bennett Snerf / Old Mother Hubbard / Sandy the Snake / The Announcer

Roscoe Orman
Gordon

Frank Oz
Bert / Cookie Monster / Grover / Live Hand Closer / Green Cowboy / Lamont / Harvey Kneeslapper (voice)

Alaina Reed-Hall
Olivia (as Alaina Reed)

Martin P. Robinson
(voice)

Caroll Spinney
Big Bird / Oscar the Grouch (voice)