 | Richard Johnson als Hugh Drummond |
 | Daliah Lavi als Helga |
 | Beba Lončar als Pandora |
 | James Villiers als Carl Petersen |
 | Vanessa Howard als Robot No. 7 |
 | Maurice Denham als Mr. Mortimer |
 | Robert Morley als Miss Mary |
 | Sydne Rome als Flicky |
 | Adrienne Posta als Drummond's Daily |
 | Florence Desmond als Lady Manderley |
 | Ronnie Stevens als Peregrine Carruthers |
 | Virginia North als Robot No. 9 |
 | Nicholas Phipps als Lord Dunnberry |
 | Yutte Stensgaard als Robot No. 1 |
 | George Belbin als Maj. Newman |
 | Richard Hurndall als President of Aircraft Company |
 | Marga Roche als Birgit |
| Douglas Sheldon als Kruger |
 | Maria Aitken als Robot Flight Attendant (uncredited) |
 | Bob Anderson als Senior Aerodynamics Engineer (uncredited) |
| Peter Brace als Petersen Bodyguard (uncredited) |
 | Johnny Briggs als Air Traffic Controller (uncredited) |
 | Shakira Caine als Robot Observer (uncredited) |
 | Carmen Dene als Party Girl in Green Dress (uncredited) |
 | Frank Gatliff als Man Sitting Behind Pilot |
 | Philip Gilbert als Test Co-Pilot (uncredited) |
| Dora Graham als Robot Twin (uncredited) |
| Doris Graham als Robot Twin (uncredited) |
| Aidan Harrington als Test Navigator (uncredited) |
| William Kendall als Wing Commander Aston (uncredited) |
 | Juba Kennerley als Test Area Official with Bow Tie (uncredited) |
| Olga Linden als Blond Robot in Green Jumpsuit (uncredited) |
 | Joanna Lumley als Robot Saboteur (uncredited) |
| John Paul als Test Pilot (uncredited) |
| Patsy Snell als Brunette Robot with Bangs (uncredited) |
 | Guy Standeven als Flight Test Observer (uncredited) |
 | Totti Truman Taylor als Cookery Student Wearing Hat (uncredited) |
| Jim Tyson als Hefty Cookery Student (uncredited) |
| Les White als Petersen Bodyguard (uncredited) |
| Edward Marshall | Art Direction |
| Ralph Thomas | Director |
| Ernest Steward | Director of Photography |
| Betty E. Box | Producer |
| Ernest Hosler | Editor |
| Charles Blackwell | Original Music Composer |
| Herman C. McNeile | Characters |
| Liz Charles-Williams | Writer |
| David D. Osborn | Writer |
| Basil Newall | Makeup Artist |
| Peter Diamond | Stunts |
| Charles Staffell | Special Effects |
| James Bawden | Camera Operator |
| Simon Relph | Assistant Director |
| Nigel Wooll | Second Assistant Director |
| Donald Toms | Production Manager |
| Yvonne Caffin | Costume Coordinator |
| Garth Inns | Special Effects |
| Don Sharpe | Sound Editor |
| Gladys Goldsmith | Continuity |
| Stella Rivers | Hairdresser |
| Jimmy Ward | Special Effects |
| Charles Blackwell | Music Director |
| Helene Bevan | Hairdresser |
| Kit West | Special Effects |
| James H. Ware | Associate Producer |
| Martin Atkinson | Set Dresser |
| Gerard Fairlie | Characters |
| Ken Barker | Sound Recordist |
| Eddie Knight | Makeup Artist |
| Miguel Gil | First Assistant Director |
| Dudley Messenger | Sound Recordist |
