Suspect
VoltarElenco
Tony BrittonDr. Robert Marriott
Virginia MaskellDr. Lucy Byrne
Ian BannenAlan Andrews
Kenneth GriffithDr Shole
Peter CushingProfessor Sewell
Thorley WaltersSpecial Agent Prince
Donald PleasenceParsons, alias Bill Brown
Spike MilliganArthur, lab orderly
Raymond HuntleySir George Gatting the Minister of Defense
Sam KyddSlater
Anthony BoothParkin
Basil DignamDr Childs
Brian OultonDirector- Robert BruceLevers
John PayneIverson- Bruce WightmanPhil the Barman
Geoffrey BayldonRosson
Andre CharisseHeller
Ian WilsonPin Table Man
Margaret LaceyPrince's Secretary
Murray MelvinTeddy Boy
