Mel Brooks
(Dr. Richard H. Thorndyke),
Madeline Kahn
(Victoria Brisbane),
Cloris Leachman
(Nurse Charlotte Diesel),
Barry Levinson
(Dennis - Bellboy),
Charlie Callas
(Cocker Spaniel),
Ron Carey
(Brophy),
Ron Clark
(Zachary Cartwright III),
Rudy De Luca
('Braces' - Killer),
Lee Delano
(Norton),
Murphy Dunne
(Piano Player),
Al Hopson
(Man Who is Shot),
Harvey Korman
(Dr. Charles Montague),
Howard Morris
(Professor Lilloman),
Robert Ridgely
(Flasher),
Jack Riley
(The Desk Clerk),
Richard Stahl
(Dr. Baxter - Institute),
Dick Van Patten
(Dr. Philip Wentworth),
Darrell Zwerling
(Dr. Eckhardt - Institute)