Stuart Whitman as Captain Welch

Persis Khambatta as Sylvia Kruger

Angus Scrimm as Soviet Destroyer Captain

Leon Askin as

Martin Beck as C.I.A. Man - Berlin

Emile Beaucard as Soviet Sub Exec

Paul Mantee as

Paul Comi as

b.g. miller as

Robert Clarke as

Simmy Bow as

Duncan McLeod as

Harvey Vernon as

Bart Braverman as