Richard Todd as Lieutenant-Commander John Simon Kerans

William Hartnell as Leading Seaman Leslie Frank

Akim Tamiroff as Colonel Peng

Donald Houston as Lieutenant Weston

Keye Luke as Captain Kuo Tai

Sophie Stewart as Miss Charlotte Dunlap

Robert Urquhart as Flight Lieutenant Fearnley

Richard Leech as Lieutenant Strain

Barry Foster as Petty Officer McCarthy

Thomas Heathcote as Mr. Monaghan

Sam Kydd as Able Seaman Walker

Ewen Solon as ERA Williams

Kenneth Cope as Mr. McNamara

Alfred Burke as Petty Officer

Richard Coleman as Lieutenant Commander Skinner

Ian Bannen as Able Seaman Bannister

Gene Anderson as Ruth Worth

Bernard Cribbins as Able Seaman James Bryson

Brian Smith as Boy Martin

Ray Jackson as Telegraphist Jack Leonard French

Anthony Chinn as PLA Officer

Allan Cuthbertson as Captain Donaldson

Basil Dignam as Sir Lionel Henry Lamb, British Ambassador to China

John Paul as Staff Officer Operations

Ralph Truman as Vice Admiral

Jeremy Burnham as Flag Lieutenant

Cyril Luckham as Commander in Chief

Michael Brill as Lieutenant Peter Egerton

Ballard Berkeley as Lieutenant Colonel Dewar-Curie

Keith Faulkner as Signalman

Rhett Ward as Lieutenant Mirehouse

Philip Vickers as Surgeon Lieutenant Packard

Tsai Chin as Sampan Woman