



| Anyone famous in it? | Brian Donlevy - a former American 'heavy' actor, nominator for an Oscar for Beau Geste (1939) Sid James - the lusty star of most of the English Carry On... comedy films. |
| Directed by anyone interesting? | Val Guest - A former comedy director who shot many important Hammer films between 1954 and 1960 including their first colour picture Men of Sherwood Forest (1954) and crime drama Hell is a City (1960). |
| Is it scary? | A couple of scenes might prove scary, but not much. |
| Any violence/gore? | A lot of rather brutal (for the times) killings with blood and gory effects. |
| Any sex? | None. |
| Who is it for? |
Fans of conspiracy sci-fi pictures should enjoy this above average production. |
| Good Soundtrack? | A strong soundtrack from Hammer regular James Bernard. |
| Visuals | Original Aspect Ratio - 1.33:1 fullscreen. Black and White. The print is decent, with little print damage but very heavy grain, especially in the night-scenes. |
| Audio | English language mono. Mostly fine. |
| Subtitles | None. |
| Run-time | Feature: 1hr 21m 07s (PAL) |
| Extras | The disc includes:
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| Availability | Available as a single-disc release or in the Hammer Horror: The Early Classics boxset. Both include the booklet. Was also available in a dual-pack with The Quatermass Xperiment. |
| Region | Region 2 (UK, Europe) - PAL |
| Other regions? | E-M-S German R2 DVD (title Feinde aus dem Nichts) and ABUS R1 DVD. Both include audio commentary, neither include interview. |
| Cuts? | None known - this print is the original British cinema version. |