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2026 marks the 70th anniversary of this suspenseful science-horror classic from legendary writer Jimmy Sangster, as X the Unknown makes its worldwide 4K premiere. Widely regarded as the “missing chapter” of the Quatermass series, this landmark film has been newly restored by the teams at Hammer and Silver Salt Restoration.
When a soldier dies from apparent radiation poisoning, the Atomic Energy Commission dispatches scientist Dr. Royston (Academy Award® winner Dean Jagger) to investigate. Despite extensive testing, no source can be identified—until a mysterious, radioactive, mud-like entity resurfaces and begins claiming more victims. What do you do when the threat cannot be stopped—or even understood?
Limited Edition Contents
This premium edition includes:
Four-disc set housed in a stylish digipak (2 x 4K UHD + 2 x Blu-ray), with Hammer content duplicated across both formats
Three versions of the film:
1.66:1 UK Theatrical Version (widescreen)
1.37:1 As-Filmed Version (fullscreen)
1.85:1 US Theatrical Version (widescreen)
Subtitles: English, French, Italian, Spanish, German (all versions)
Brand-new 5.1 audio mix for the 1.37:1 and 1.66:1 versions, alongside the original mono soundtrack
High-end leather-feel slipcase
Rigid inner box featuring new artwork by Robert Sammelin
Double-sided poster featuring original one-sheet artwork
Eight art cards reproducing original cinema lobby cards
120-page booklet featuring new essays, production insights, cast/crew bios, script comparisons, and more
Special Features
A Man on the Beach – Rare early Hammer short film written by Jimmy Sangster and directed by Joseph Losey
New audio commentaries featuring:
Toby Hadoke & Andy Murray
Dr. Steve Haberman & Constantine Nasr
David Kalat
Archive 2003 commentary with Jimmy Sangster & Marcus Hearn
Commentary on A Man on the Beach by Neil Sinyard
New documentary on the making of X the Unknown
New documentary on special effects pioneer Les Bowie
Documentary on Joseph Losey and his involvement with the project
Sidebar: X the Unknown – discussion with Tim Lucas & Stephen R. Bissette
Archive Jimmy Sangster interview (2003)
Original trailers, censor card, and Super 8 cut-down version
Extensive stills and publicity image gallery
Technical Specifications
Audio: English Mono / 5.1
Discs: 2 x 4K UHD + 2 x Blu-ray
Region: UHD Region Free / Blu-ray Region ABC
Rating: PG
Runtime: 1 hour 20 minutes
Subtitles: English, French, Italian, Spanish, German
