Actors:
William Abney as Ian Murray,
Paul Armstrong as Premier Petrov,
Trevor Bannister as Peter Barry,
Brandon Brady as Brian Barclay,
Toni Gilpin as Terry,
Roy Herrick as Radio operator,
Barry Lowe as Dr O'Toole,
Margaret Neale as June Challis,
Ralph Nossek as Professor Ramsay,
Denys Peek as Robert Duncan,
David Saire as Dallier,
Julian Somers as Sir John Chandos,
Arthur White as Keeler,
Terence Woodfield as The Voice,
