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Kieron MooreCmdr. Michael Haydon
Lois MaxwellKim Hamilton
Donald WolfitProf. Merrity
Bryan ForbesJimmy Wheeler
Jimmy HanleyLarry Noble
Barry KeeganLefty
Walter HuddProfessor Blandford
Donald GrayCaptain RossThea GregoryBarbara NobleShirley LawrenceEllenPeter NeilTonyRyck RydonReporter
Ronan O'CaseyReporter
Robert O'NeilReporter
Alan GiffordColonel GallowayCharles RichardsonGeneral Barnett
Carl JaffeProfessor BechsteinLeonard SharpThomas the Watchman (uncredited)Paul BeradiReporter (uncredited)Patrick HalpinReporter (uncredited)Terry RandallReporter (uncredited)
Bill NagyReporter (uncredited)Terry RandallReporter (uncredited)John WilderReporter (uncredited)Johnny WyneReporter (uncredited)
Trevor ReidSimmons the Technician (uncredited)
Bernard BresslawTechnician (uncredited)
Alastair HunterTechnician (uncredited)Jane DoreYoung Girl (uncredited)Frank SiemanGatekeeper (uncredited)John BakerOfficial (uncredited)Tony QuinnJack the BarmanTony QuinnJack the Barman (uncredited)
