Alfred Hitchcock Host, Executive Producer Barry Nelson Raymond Houston Actor Everett Sloane Mr. Marriner Actor Shaike Ophir Bourdette Actor Charles Davis Museum Guard Actor Lawrence Conroy Armstrong Actor Mavis Neal Palmer Museum Attendant Actor Betty Fairfax Mrs. Nop Actor Richard Lupino Actor Hal Thompson Actor John O'Leary Actor Patrick Westwood Actor Dorothy McKinnon Actor Vincent Perry Actor Robert Stevens Director Casey Robinson Writer A. M. Burrage Writer