Humphrey Bogart as Valentine "Val" Stevens

Margaret Lindsay as Lucille Gordon

Donald Woods as Eric Blake

E. E. Clive as Dr. Hardy

Paul Graetz as Captain Deever

Gordon Hart as Antvar 'Chris' Anderson

George Regas as Otar

Sidney Bracey as Sam

Tetsu Komai as Kim Lee

Miki Morita as Oh Kay

Houseley Stevenson as The Rector

Frank Lackteen as Lanar

George Piltz as Best Native Diver (uncredited)