Old American kinofantastiki. Tell me the name.

In General, the film is old, like even black and white. Filmed in the style of westerns and detective. The main character seems to be something investigating on some planet. There everything is like in the wild West. Well or all to imitate the style of the wild West. I remember the episode as gg pressed like they wanted a bad guy and the bad guy turns into a powerful alien that can blow up the planet. But then like they amicably agree and all ends well. The film is shot with humor and the like is not on the knee, the frame watchable. Year, based on the black-and-belosto may be from the 1950s to the 1970s. Can anyone pliz name.