Adventures of Captain Marvel
The serial featured an adaptation of the Fawcett Comics superhero, placed within an original story in which he fights a criminal mastermind, called The Scorpion, who is determined to gain total control of a magical gold scorpion figurine. It is actually a disguised optical weapon of incredible power (including, but not limited to, melting rock via a projected death ray).
Billy Batson is an assistant radio operator with the Malcolm archaeological expedition to "the Valley of the Tombs" in Siam. The expedition is attacked by natives but Tal Chotali parleys with Rahman Bar. A sacred legend states no desecration will occur until the volcano, Scorpio, is active again. At the tombs, Billy refuses to enter the inner tomb as it would desecrate the religious beliefs of others. Instead he goes to pack pottery in another tunnel. In the inner tomb, Tal Chotali, Prof Malcolm, Prof Luthor Bentley, Dwight Fisher, and Dr Stephen Lang, find the Golden Scorpion. A ray from the Scorpion collapses the entrance to the tombs and opens a hidden passage between Billy and the ancient wizard Shazam. Shazam grants him the ability to change into Captain Marvel in order to prevent the Golden Scorpion from falling into the wrong hands. It is his "duty to see that the curse of the Scorpion is not visited on innocent people."