Also Known As:
.
- Le monstre
- Xperiment Q
- Astronave atomica del dottor Quatermass
- El experimento del Dr. Quatermass
- O Monstro do Espaço
- Quatermass
- Schock
- Shock
- The Creeping Unknown
- The Quatermass Experiment
- The Quatermass Xperiment
- X the Experiment
- Val Guest
- Richard H. Landau
- Val Guest
- Nigel Kneale
- Brian Donlevy ... Prof. Bernard Quatermass
- Jack Warner ... Insp. Lomax
- Margia Dean ... Mrs. Judith Carroon
- Thora Hird ... Rosemary 'Rosie' Elizabeth Rigly
- Gordon Jackson ... BBC TV producer
- David King-Wood ... Dr. Gordon Briscoe
- Harold Lang ... Christie
- Lionel Jeffries ... Blake
- Sam Kydd ... Police sergeant questioning Rosie
- Richard Wordsworth ... Victor Carroon
- Jane Aird ... Mrs. Lomax
- Margaret Anderson ... Maggie
- Jane Asher ... Little Girl
- Harry Brunning ... Night Porter
- Eric Corrie ... Maggie's Boyfriend
- Edward Dane ... Station Policeman
- Gron Davies ... Charles Green
- Basil Dignam ... Sir Lionel Dean
- James Drake ... Sound Engineer
- Mollie Glessing ... Mother at Zoo
- Michael Godfrey ... Crash Site Fireman
- Donald Gray ... TV Announcer
- Arthur Gross ... TV Floor Director
- Ernest Hare ... Crash Site Fire Chief
- Betty Impey ... Central Clinic Nurse
- Fred Johnson ... Inspector
- Maurice Kaufmann ... Marsh
- John Kerr ... Film Lab Technician
- Henry B. Longhurst ... George - Maggie's Father
- Arthur Lovegrove ... Sgt. Bromley
- Barry Lowe ... Tucker - Night Nurse
- Mayne Lynton ... Zoo Superintendent
- Bartlett Mullins ... Zookeeper
- Frank Phillips ... BBC Announcer
- George Roderick ... Local Policeman
- John Stirling ... Major at Crash Site
- Marianne Stone ... Central Clinic Nurse
- Toke Townley ... The Chemist
- Stanley Van Beers ... Dr. Ludwig Reichenheim
- John Wynn ... Det. Sgt. Best
.