Haring Cobra (1951)

Felipe, a dockworker in a seaport city, is approached by two men one day with a proposition--it seems he bears a striking resemblance to a monarch named Haring Cobra, who was the leader of an island kingdom but was overthrown by a usurper. Haring Cobra is ready to give Felipe a large sum of money to impersonate him so that the usurper can't marry his fiancé, the lovely Amahda, and to allow Haring Cobra to gather his forces to take his throne back. However, when Felipe arrives at the island, he finds that things aren't exactly the way he was told they are.