Journalist Mike Harway decides to help his friend Christine in her search for her father, professor Baker, who mysteriously disappeared. The investigation brings them to Africa where they are captured and brought to the El Faium abandoned fort. It now hosts a laboratory designed by the twisted mind of Devilman, who dreams of swapping his natural brain with an artificial one that will make him perfect.
A masked wrestler/superhero goes up against a madman and his army of robots.
A young cowboy, Johnny, playing in a rigged poker game is forced to shoot one of the other players. The cowboy takes quick leave as he is accused of murder and a reward for his capture is posted. After being wounded, he finds refuge on a ranch and becomes involved with the family. While he is away, a gang of Mexicans kills the McGowan family except for Sally, who manages to escape and find Johnny who is now out for revenge.
Anthony Steffen, as a young gunman who works as a circus performer, witnesses the killing of some outlaws, carried out by their leader and is credited with the deed. Steffen suffers from a complex which blocks him in front of any violence and makes him appear cowardly, so when a young boy is kidnapped he must find a way to regain his composure.
Vittorio, an employee of an insurance company, is the only witness to an incident where a thief called the golden chameleon dies. In his suitcase Vittorio finds the instructions to carry out a robbery. He decides to assume the identity of the golden chameleon and carry out the robbery.
Three men meet in the same prison and in their cell they find a Mexican boy condemned to death for murder. One night the three convicts are mysteriously released by a priest and the father of the Mexican boy who promises them a reward of $30,000 if they can find the real murderer within ten days. Certain that the Mexican boy is not guilty, Reno and the others organize a plan which leads to the unmasking of the real killers.
Secret agent Perry Grant is called in to investigate a strange case which involves counterfeit money, industrial espionage, and a fashion company that may be functioning as a front for a secret criminal organization.
