Charles Coburn as Samuel Fulton / John Smith

Piper Laurie as Millicent Blaisdell

Rock Hudson as Dan Stebbins

Gigi Perreau as Roberta Blaisdell

Lynn Bari as Harriet Blaisdell

Larry Gates as Charles Blaisdell

William Reynolds as Howard Blaisdell

Skip Homeier as Carl Pennock

Paul Harvey as Judge Wilkins

Paul McVey as Lester Pennock

Gloria Holden as Clarissa Pennock

Frank Ferguson as Edward Norton

Forrest Lewis as Martin Quinn

James Dean as Youth at Soda Fountain (uncredited)

James Anderson as Chauffeur (uncredited)

Paul Bryar as Doorman at Poker Game (uncredited)

Gino Corrado as Peanut Vendor (uncredited)

William Fawcett as Caretaker (uncredited)

Fritz Feld as Alvarez (uncredited)

Dick Gordon as Party Guest (uncredited)

Forbes Murray as Party Guest (uncredited)

Charles Sherlock as Party Guest (uncredited)

Edna Holland as Seamstress (uncredited)

Philo McCullough as Mr. Benson (uncredited)

Jack Mower as Court Clerk (uncredited)

Spec O'Donnell as Candy Seller (uncredited)

Emory Parnell as Policeman (uncredited)

Barney Phillips as Workman (uncredited)

Helen Wallace as Shirley White (uncredited)

Willard Waterman as Dr. Wallace (uncredited)

Lyn Wilde as Charleston Dancer (uncredited)