Richard Johnson as Hugh Drummond

Daliah Lavi as Helga

Beba Lončar as Pandora

James Villiers as Carl Petersen

Vanessa Howard as Robot No. 7

Maurice Denham as Mr. Mortimer

Robert Morley as Miss Mary

Sydne Rome as Flicky

Adrienne Posta as Drummond's Daily

Florence Desmond as Lady Manderley

Ronnie Stevens as Peregrine Carruthers

Virginia North as Robot No. 9

Nicholas Phipps as Lord Dunnberry

Yutte Stensgaard as Robot No. 1

George Belbin as Maj. Newman

Richard Hurndall as President of Aircraft Company

Marga Roche as Birgit

Douglas Sheldon as Kruger

Maria Aitken as Robot Flight Attendant (uncredited)

Bob Anderson as Senior Aerodynamics Engineer (uncredited)

Peter Brace as Petersen Bodyguard (uncredited)

Johnny Briggs as Air Traffic Controller (uncredited)

Shakira Caine as Robot Observer (uncredited)

Carmen Dene as Party Girl in Green Dress (uncredited)

Frank Gatliff as Man Sitting Behind Pilot

Philip Gilbert as Test Co-Pilot (uncredited)

Dora Graham as Robot Twin (uncredited)

Doris Graham as Robot Twin (uncredited)

Aidan Harrington as Test Navigator (uncredited)

William Kendall as Wing Commander Aston (uncredited)

Juba Kennerley as Test Area Official with Bow Tie (uncredited)

Olga Linden as Blond Robot in Green Jumpsuit (uncredited)

Joanna Lumley as Robot Saboteur (uncredited)

John Paul as Test Pilot (uncredited)

Patsy Snell as Brunette Robot with Bangs (uncredited)

Guy Standeven as Flight Test Observer (uncredited)

Totti Truman Taylor as Cookery Student Wearing Hat (uncredited)

Jim Tyson as Hefty Cookery Student (uncredited)

Les White as Petersen Bodyguard (uncredited)