Currently running on Pro7. This reminded me that I wanted to compile a list of the different versions of this theme sometime, so I'd have them ready when I want them. The original material is certainly Yojimbo by Akira Kurosawa. But the most well-known version of the material is certainly For a Fistfull of Dollars by Sergio Leone. And then there's Last Man Standing by Walter Hill. Okay, and now for the puzzle: a few weeks ago I stumbled upon a sci-fi version of it and forgot what it was called. It wasn't impressive, but for completeness I'd like to have it listed here too. Any takers?