Casting de La Marque
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Brian DonlevyProf. Bernard Quatermass
John LongdenChief Inspector Lomax
William FranklynDr. Tom Brand
Bryan ForbesMarsh
Charles Lloyd PackWork Camp Manager Dawson- Tom ChattoVincent Broadhead, M.P.
John Van EyssenThe Plant Tour Guide
Sid JamesJimmy Hall
Percy HerbertPaddy Gorman
Michael RipperErnie the Bartender- John RaeE. J. Macleod
- Philipp BairdLab Assistant
- Betty ImpeyKelly
- Joyce AdamsWoman Member of Parliament
Edwin RichfieldPeterson
Vera DaySheila
Marianne StoneMiss Beal- Jane AirdMrs. McLeod
- Michael BalfourHarry
John StuartThe Police Commissioner
John FabianIntern
George MerrittSuper- Barry LoweChris (uncredited)