The Fighting Marines

Corporal Larry Grant and Sergeant "Mac" McGowan, both members of the U.S. Marine Corps, find themselves in competition for the affection of Frances Schiller. However, their rivalry takes a back seat when they unite to track down the diabolical "Tiger Shark," a mad scientist who has kidnapped Frances' brother, Sergeant William Schiller. Their mission unfolds on a perilous jungle island in the Pacific, where bravery and teamwork are put to the ultimate test against a formidable foe.