(uncredited)
Blue Demon returns in one of his best adventures like Agent Zero, who this time is facing a criminal organization that attempts to poison the world with a deadly gas (whose formula is unknown). This time, Zero (Blue Demon) is the only one qualified to investigate and prevent Hans plans, the evil leader of the organization.
Rene, a street urchin, is coerced by the head of a gang of thieves, Frank, who wants to force him to remain in their organization. One day, Rene meets Anita, a young aristocrat to whom Frank attempted to rob. And because she feels sympathy for him, the boy will have the opportunity to change his life and leave the country to make a deal with a rich heir, Fernando de Ponce, which proposes Rene to supplant him before his old aunt, who does not know him.
