By the way, cowboys and Aliens was taken from a "comic" Many of the scenes were straight from the comic, such as the one where he is staring straight up through the blasted roof. Some lot weaknesses, such as the alien interest in gold when there are other more useful minerals and far easier to get at in the asteroid belt, without having to deal with those pesky humans, BUT, a pretty good standalone movie. No need for a sequel, no need for any explanation. It fit.