Don Winslow of the Coast Guard is a 1943 Universal Pictures Serial film based on the comic strip Don Winslow of the Navy by Frank V. Martinbek.

Plot
After service at Pearl Harbor, Naval Commander Don Winslow, and his friend and junior officer, Lieutenant “Red” Pennington, are assigned to the Coast Guard. There they are ordered to devote their activities to anti-fifth column work on the mainland. Winslow learns that The Scorpion, a fascist sympathizer, is in the pay of the Japanese and is expected to lay the ground work for a Japanese attack on the Pacific coast. Constantly in peril and aided by Mercedes Colby, the daughter of a Navy Admiral, they investigate secret island-bases and battles with submarines and enemy planes.

Cast
Don Terry as Don Winslow
Walter Sande as Red Pennington
Elyse Knox as Mercedes Colby
Philip Ahn as Hirota
June Duprez as Tasmia
Edgar Dearing as CP0 Ben Cobb
Lionel Royce as Reichter
Henry Victor as Heilrich
Charles Wagenheim as Mussanti
Nestor Paiva as The Scorpion