- Writer:
- Nigel Kneale
- Producer:
- Rudolph Cartier
- Special effects (sound):
- BBC Radiophonic Workshop
- Special effects (vision):
- Jack Kine
- Special effects (vision):
- Bernard Wilkie
- Film cameraman:
- A. A. Englander, F.R.P.S.
- Film editor:
- Ian Callaway
- Telerecording editor:
- Sheila Tomlinson
- Music composed by:
- Trevor Duncan
- Designer:
- Clifford Hatts
- Professor Quatermass:
- Andre Morell
- Colonel Breen:
- Anthony Bushell
- Captain Potter:
- John Stratton
- Sergeant:
- Michael Ripper
- Dr Matthew Roney:
- Cec Linder
- Barbara Judd:
- Christine Finn
- Corporal Gibson:
- Harold Goodwin
- First Sapper:
- Clifford Cox
- Second Sapper:
- Brian Gilmar
- James Fullalove:
- Brian Worth
- News editor:
- Tony Quinn
- First journalist:
- Bill Shine
- Second journalist:
- Allan McClelland
- Sladden:
- Richard Shaw
- The Minister:
- Robert Perceval
- Private Secretary:
- Richard Dare
- Police Inspector:
- Ian Ainsley
- Policeman:
- Patrick Connor
- Vicar:
- Noel Howlett
- Electrician:
- Harold Siddons
- Official:
- Edward Burnham
- Technician:
- John Scott Martin
- Woman journalist:
- Anne Blake
- TV interviewer:
- Anthony Pendrell
- Newscaster:
- Stuart Nichol
- American pilot:
- Bud Knapp
- Others taking part:
- Arthur Brander
- Others taking part:
- Sydney Bromley
- Others taking part:
- Louise Gainsborough
- Others taking part:
- John Hamblin
- Others taking part:
- Kenneth Seeger
- Others taking part:
- Bernard Spear
- Others taking part:
- Ian Wilson
