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