Oscar-winner Dean Jagger stars as an irascible scientist in this grittily thrilling science-horror film from legendary Hammer writer Jimmy Sangster. Featuring spirited support from Leo McKern, William Lucas, and Anthony Newley, X the Unknown has been painstakingly restored by Hammer in 4K from the original film negatives. When an unlucky squaddie dies in agony from radiation poisoning, the Atomic Energy Commission dispatches Dr Royston to investigate. Royston finds no trace of the deadly radiation, but it soon begins to claim new victims.

• Includes 4K UHD and Blu-ray formats.
• Painstakingly restored in 4K from original film negatives by Hammer.
• Features three iterations of the film: the widescreen 1.66:1 UK Theatrical Version, the fullscreen 1.37:1 As-Filmed Version, and the widescreen 1.85:1 US Theatrical Version.
• Includes brand-new 5.1 mix for 1.37:1 and 1.66:1 versions alongside the original mono film soundtrack.
• Rated Parental Guidance.
• Run time is 1 hour and 20 minutes.

• Four discs in a stylish digipak (2 UHD and 2 Blu-ray).
• High-end, leather-feel slipcase.
• A rigid inner box featuring new artwork by Robert Sammelin.
• A double-sided poster of original one-sheets.
• Eight art cards featuring facsimiles of the original cinema lobby cards.
• Bonus Content including new film commentaries, documentaries, and featurettes.

• A Man on the Beach: a rare, early Hammer short film, written by Jimmy Sangster and directed by Joseph Losey.
• New commentary with actor/comedian Toby Hadoke and Nigel Kneale’s biographer Andy Murray.
• New commentary with writer/producer Dr Steve Haberman and film-maker/historian Constantine Nasr.
• New commentary with film historian David Kalat.
• Archive 2003 commentary featuring writer Jimmy Sangster and Hammer expert Marcus Hearn.
• New commentary on A Man on the Beach by film expert Neil Sinyard.
• New documentary on the making of X the Unknown.

• Brand: Hammer Films
• Format: 4K, Blu-ray
• Edition: Collector's Edition
• Release Date: 27 July 2026
• Run Time: 1 hour and 20 minutes
• Actors: Dean Jagger, Edward Chapman, Leo Mckearn
• Directors: Joseph Losey, Leslie Norman
• Language Tracks: English, French, Italian, Spanish
• Subtitles: English, French, Italian, Spanish, German
• Package Dimensions: 17 x 13.7 x 1.5 cm; 250 g
• Rating: Parental Guidance

Experience this classic science-horror restored to its finest presentation with extensive collector materials.