Anthony Perkins as Jimmy Piersall

Karl Malden as John Piersall

Norma Moore as Mary Piersall

Adam Williams as Doctor Brown

Perry Wilson as Mrs. John Piersall

Peter J. Votrian as Jim Piersall as a Boy

Richard Bull as Reporter Slade (uncredited)

Morgan Jones as Sandy Allen (uncredited)

Edd Byrnes as Boy in Car Assisting Jimmy Up Stairway (uncredited)

Brian G. Hutton as Bernie Sherwill (uncredited)

Bart Burns as Joe Cronin (uncredited)