| Videos |
| Dean Jagger | ... | Dr. Adam Royston | |
| Edward Chapman | ... | John Elliott | |
| Leo McKern | ... | Insp. McGill | |
| Anthony Newley | ... | LCpl. 'Spider' Webb | |
| Jameson Clark | ... | Jack Harding | |
| William Lucas | ... | Peter Elliott | |
| Peter Hammond | ... | Lt. Bannerman | |
| Marianne Brauns | ... | Zena, the Nurse | |
| Ian MacNaughton | ... | Haggis | |
| Michael Ripper | ... | Sgt. Harry Grimsdyke | |
| John Harvey | ... | Maj. Cartwright | |
| Edwin Richfield | ... | Soldier Burned on Back | |
| Jane Aird | ... | Vi Harding | |
| Norman Macowan | ... | Old Tom | |
| Neil Hallett | ... | Unwin | |
| Kenneth Cope | ... | Sapper Lansing | |
| Michael Brooke | ... | Willie Harding | |
| Frazer Hines | ... | Ian Osborn | |
| rest of cast listed alphabetically: | |||
| Max Brimmell | ... | Hospital Director (uncredited) | |
| Robert Bruce | ... | Dr. Kelly (uncredited) | |
| Angela Crow | ... | Bit part (uncredited) | |
| Brown Derby | ... | Vicar (uncredited) | |
| Raymond Dudley | ... | Bit part (uncredited) | |
| Archie Duncan | ... | Sgt. Yeardye (uncredited) | |
| Lawrence James | ... | Gerard (uncredited) | |
| Edward Judd | ... | 2nd Soldier (uncredited) | |
| Stella Kemball | ... | Willie's Room Nurse (uncredited) | |
| Jack Lambert | ... | (uncredited) | |
| Stevenson Lang | ... | Reporter (uncredited) | |
| Philip Levene | ... | Security man (uncredited) | |
| Brian Peck | ... | 1st Soldier (uncredited) | |
| Anthony Sagar | ... | Gateman (uncredited) | |
| Barry Steele | ... | Soldier in trench (uncredited) | |
| John Stirling | ... | Police Car Driver (uncredited) | |
| John Stone | ... | Jerry (uncredited) | |
| French Taylor | ... | PC Williams (uncredited) | |
| Shaw Taylor | ... | Police Radio Operator (uncredited) | |
| Neil Wilson | ... | Russell (uncredited) | |
Directed by | |||
| Leslie Norman | |||
Writing credits | ||
| Jimmy Sangster | (story) | |
| Jimmy Sangster | (screenplay) | |
Produced by | |||
| Michael Carreras | .... | executive producer | |
| Anthony Hinds | .... | producer | |
| Mickey Delamar | .... | associate producer (uncredited) | |
Original Music by | |||
| James Bernard | |||
Cinematography by | |||
| Gerald Gibbs | |||
Film Editing by | |||
| James Needs | |||
Casting by | |||
| Joseph Losey | (uncredited) | ||
Art Direction by | |||
| Ted Marshall | (uncredited) | ||
Makeup Department | |||
| Philip Leakey | .... | makeup artist | |
| Philip Leakey | .... | special makeup effects | |
Production Management | |||
| Jimmy Sangster | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Christopher Sutton | .... | assistant director (as Chris Sutton) | |
| Hugh Harlow | .... | third assistant director (uncredited) | |
Art Department | |||
| Don Mingaye | .... | draughtsman (uncredited) | |
Sound Department | |||
| Alfred Cox | .... | sound editor | |
| Jock May | .... | sound mixer | |
| Jim Perry | .... | boom operator (uncredited) | |
Special Effects by | |||
| Jack Curtis | .... | special effects | |
| Les Bowie | .... | special effects (uncredited) | |
| Vic Margutti | .... | special effects (uncredited) | |
Camera and Electrical Department | |||
| Len Harris | .... | camera operator | |
| Tom Edwards | .... | still photographer (uncredited) | |
| Harry Oakes | .... | focus puller (uncredited) | |
Costume and Wardrobe Department | |||
| Molly Arbuthnot | .... | wardrobe supervisor | |
Music Department | |||
| John Hollingsworth | .... | conductor | |
Other crew | |||
| June Randall | .... | continuity | |
| Bill Batchelor | .... | publicist (uncredited) | |
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| The Life and Death of Colonel Blimp | The Mist | Resident Evil: Apocalypse | Fiend Without a Face | The Incredible Hulk |
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| Full cast and crew | Company credits | External reviews |
| IMDb Sci-Fi section | IMDb UK section | Add this title to MyMovies |
First saw this excellent British Sci-Fi film when I was 10 or 11 at our local neighborhood theater. It seems like yesterday, since the invisible monster scared the Hell out of all of us.
This was the first of many other Brit Sci-Fi movies we would scream our guts out at. They were far ahead of U.S. film makers in suspense and realism. The casts were also superior in their acting skills for this genre.
I hope to locate many more movies like "X The Unknown" to see how I view them now as an adult. The initial impact may be less than it was originally.