Don Winslow of the Navy is a 1942 Universal Pictures Serial film based on the comic strip Don Winslow of the Navy by Commander Frank V. Martinek. It was theatrically released in January 1942.

Plot
Commander Don Winslow is returned to the Office of Naval Intelligence from his command of his cruiser to investigate strange events on the Pacific island of Tangita, noticeably a ship being torpedoed. He discovers that there is a ring of saboteurs and enemy agents who are trying to destroy ships carrying supplies to the troops stationed in the islands and sabotage the war effort. Though the US Navy is preparing to build a naval base on Tangita, an unknown foreign power secretly has a subterranean submarine base beneath the island with the goal of preventing the American base from being completed. He sets out with three assistants to find the mastermind behind the activities.

Cast
Don Terry as Cmdr. Don Winslow
Walter Sande as Lt. Red Pennington
Claire Dodd as Mercedes Colby
Anne Nagel as Misty Gaye
John Litel as Spencer Merlin
Wade Boteleter as Mike Splendor
Ben Taggart as John Blake
Kurt Katch as The Scorpion
John Holland as Paul Barsac
Ethan Laidlaw as Henchman Spike
Robert Barron as Henchman Prindle
Lane Chandler as Henchman Corley
Dirk Thane as Lt. Cmdr. Grady
Peter Leeds as Seaman Chapman
Jerry Mandy as Tangita Jim [Chs. 2, 10]
Samuel S. Hinds as Admiral Colby, The CINC-US [Ch.1]
Herbert Rawlinson as Adm. Warburton [Ch.1]
Arthur Loft as Tranker – Submarine Z-37 Captain [Chs. 1-2]
Paul Bryar as Kramer – [Chs. 3-4]