Dave Goelz

as Gonzo / Dr. Bunsen Honeydew / Waldorf / The Birdman (voice)

Steve Whitmire

as Kermit the Frog / Rizzo the Rat / Beaker / Cosmic Fish #1 / Rainbow / Miss Piggy (assistant) (voice)

Bill Barretta

as Pepe the Prawn / Bobo as Rentro / Johnny Fiama / Bubba the Rat / Cosmic Fish #2 (voice)

Jerry Nelson

as Robin / Statler / Ubergonzo (voice)

Brian Henson

as Dr. Phil Van Neuter / Sal Minella (voice)

Kevin Clash

as Clifford (voice)

Frank Oz

as Miss Piggy / Fozzie Bear / Animal / Sam the Eagle (voice)

Jeffrey Tambor

as K. Edgar Singer