Mel Brooks as Dr. Richard H. Thorndyke

Madeline Kahn as Victoria Brisbane

Cloris Leachman as Nurse Charlotte Diesel

Harvey Korman as Dr. Charles Montague

Ron Carey as Brophy

Howard Morris as Professor Lilloman

Dick Van Patten as Dr. Philip Wentworth

Jack Riley as The Desk Clerk

Charlie Callas as Cocker Spaniel

Ron Clark as Zachary Cartwright III

Rudy De Luca as 'Braces' - Killer

Barry Levinson as Dennis - Bellboy

Lee Delano as Norton

Albert Whitlock as Arthur Brisbane

Billy Sands as Customer

Richard Stahl as Dr. Baxter

Robin Menken as Cocktail Waitress

Darrell Zwerling as Dr. Eckhardt

Murphy Dunne as Piano Player

Al Hopson as Man Who is Shot

Robert Ridgely as Flasher

Pearl Shear as Screaming Woman at Gate

Arnold Soboloff as Dr. Colburn

Eddie Ryder as Doctor at Convention

Sandy Helberg as Airport Attendant

Fred Franklyn as Man from Cincinnati in Piano Bar

Deborah Dawes as Stewardess

Bernie Kuby as Dr. Wilson

Ira Miller as Psychiatrist with Children

Jimmy Martinez as Waiter in Piano Bar

Beatrice Colen as Maid in Hotel

Robert Manuel as Policeman at Airport

Hunter von Leer as Policeman at Airport

John Dennis as Orderly

Frank Campanella as Bartender

Henry Kaiser as New Groom in Piano Bar

Bullets Durgom as Man in Phone Booth

Joe Bellan as Male Attendant

Mitchell Bock as Bar Patron

Jay Burton as Patient

Bryan Englund as Orderly #2

Anne Macey as Screaming Woman in Hotel

Alan U. Schwartz as Psychiatrist

David Armstrong as Club Patron (uncredited)

Charles Cirillo as Commuter at Airport (uncredited)

Robert Cole as Club Patron (uncredited)

Paul DeCeglie as Commuter at Airport (uncredited)

Fred Fisher as Club Patron (uncredited)

Michael Frost as Hotel Desk Clerk (uncredited)

Laura Gile as Club Patron (uncredited)

Allan Graf as Man Going Through Metal Detector (uncredited)

Bart Greene as Lecture Guest (uncredited)

Robert Lussier as Thorndyke's Father in Flashback (uncredited)

Norman Palmer as Club Patron (uncredited)

Arnold Roberts as Commuter at Airport (uncredited)

George Simmons as Commuter at Airport (uncredited)

Norman Stevans as Lecture Guest (uncredited)

Robert Strong as Lecture Guest (uncredited)

Victor Toyota as Plane Passenger (uncredited)

Judith Woodbury as Club Patron (uncredited)