Action in the North Atlantic is solid wartime propaganda with a rather endearing inner lining of left-wing politics, courtesy (no doubt) of scenarist John Howard Lawson, who based his screenplay on a novel by maritime specialist Guy Gilpatric. While running war goods to America's Russian allies, a merchant marine ship captained by Raymond Massey is torpedoed. The courage of Massey and his first mate Humphrey Bogart serves as an inspiration to the survivors, who manage to navigate their tiny lifeboat to America, where they are lauded as heroes. After only the briefest of compassionate leaves (Massey is reunited with wife Ruth Gordon, while Bogart strikes up a relationship with Julie Bishop), the crew is assigned a new Liberty Ship. Despite fears of being torpedoed again, Massey, Bogart, and the other men successfully bring their cargo to Russia, shooting down several German planes in the process. As the Americans are cheered on by the smiling, well-fed Russian seamen and peasants, Action in the North Atlantic fades out, with the voice of Franklin D. Roosevelt (actually radio announcer Art Gilmore) heard on the soundtrack encouraging a "United Nations" allegiance against the axis. The supporting cast of Action in the North Atlantic includes a young newcomer by the name of Bernard Zanville, whose billing was changed to "Dane Clark" upon the film's release.