Lt. Com. Frank V. Martinek's widely circulated comic strip Don Winslow of the Navy was brought to the screen in this action-packed, 12-chapter Universal serial. The villain of the piece is The Scorpion (Kurt Katch), who has been sabotaging American military forces in the Pacific. Assigned to put an end to the Scorpion's activities, Navy intelligence operative Don Winslow heads to the remote island of Tongita. Here he must deal with a gang of clever Fifth Columnists, led by Menlin (John Litel), who are in cahoots with the head bad guy. Fortunately, Winslow is able to rely upon the courage and loyalty of his sidekick Red Pennington (Walter Sande) and nurses Misty (Anne Nagel) and Mercedes (Claire Dodd). Though the miniature work in Don Winslow of the Navy is laughably inept, the film itself is one of Universal's most satisfying chapter plays.