Dick Van Dyke
— Billy Bright
Michele Lee
— Mary Gibson
Mickey Rooney
— Cockeye
Cornel Wilde
— Frank Powers
Nina Wayne
— Sybil Atlas
Pert Kelton
— Mama Bell
Steve Allen
— Steve Allen
Barbara Heller
— Ginger
Ed Peck
— Edwin G. Englehardt
Jeannine Riley
— Lorraine Bell
Gavin MacLeod
— 1st Director
Jay Novello
— Miguel
Craig Huebing
— Doctor
Paulene Myers
— Phoebe
Fritz Feld
— Armand
Jerome Cowan
— Lawrence
Isabel Sanford
— Woman
Jeff Donnell
— Nurse
Carl Reiner
— Al Schilling
Howard Dayton
— Ketchup Man
Maurice Dallimore
— Lord Faversham
Mantan Moreland
— Passerby at Billy's Funeral (unbilled)
Frank Adamo
— Minor Role (uncredited)
Lillian Adams
— Old Lady (uncredited)
Priscilla Ann
— Consuela (uncredited)
Robert Ball
— Mike Fields (uncredited)
Rex Benson
— Minor Role (uncredited)
Mel Berger
— Fatso / Dental Patient (uncredited)
Jack Berle
— Minor Role (uncredited)
Frank Biro
— Fred - Director (uncredited)