Doctor Francis Pelham
Mary Foster
Valentine Neal
Detective Inspector Ross
Detective Sergeant Davis (as Gordon Needham)
Barbara Barton
Susie
Doctor Bradford
Doctor Kenyon (as Oliver Johnson)
Doctor Pelham's Manservant (as Tom Tan)
Porter
Self - Bandleader: Chris Barber's Jazz Band (uncredited)
Mary's Housekeeper (uncredited)
Mary's Secretary (uncredited)
Jazz Band (uncredited)
Valentine as a boy (uncredited)
Nurse (uncredited)
Observer in Control Tower (uncredited)
Valentine's Mother (uncredited)
Constable (uncredited)
Senior Test Flight Official (uncredited)
Dr. Martin (uncredited)