81 mins | Science Fiction, Horror, Mystery | Sept. 21, 1956
81 mins | Science Fiction, Horror, Mystery | Sept. 21, 1956
| IMDb rating | 6.1 |
| Producers | Hammer Film Productions |
| Original title | X the Unknown |
| Directors | Christopher Sutton, June Randall, Leslie Norman, Joseph Losey |
| Writers | Jimmy Sangster |
as Dr. Adam Royston
as Inspector McGill
as Peter Elliott
as John Elliott
as Maj. Cartwright
as Sgt. Harry Grimsdyke
as LCpl. 'Spider' Webb
as Pvt. Haggis
as Lt. Bannerman
as Pvt. Lansing
as Willie Harding
as Ian Osborn
as Russell
as Willie's Nurse
as Jack Harding
as Vi Harding
as Harry, the amorous intern
as Zena, the amorous nurse
as Hospital Superintendant
as The Vicar
as Old Tom
as Rear Gate Night Watchman
as Soldier Burned on Back
as Gerry
as Gerard
as Constable Williams
as Police Car Driver
as Police Sergeant
as Sgt. Yeardye