Okay, in my time of posting public domain comics here on my blog, I can say this is probably the most mind blowing concept comic I've ever encountered. Long before the idea of Transparent Mashups was even coined, Charlton Comics pioneered the concept with their zany comic Space Western.
What's interesting is this the actual idea of Space Westerns was a common theme in comics and science fiction, but usually there was an attempt to blend the elements.
However, such subterfuge is unnecessary for Space Western. Here,
Spur wearing cowboys and warpaint wearing Indians clash against ray gun welding Martians for the fate of humanity.
In this issue Spurs Jackson and his Space Vigilantes who in one issue fight Nazis on Mars
[ Space Western 44 ]
In this issue Strong Bow, a Native American who helps the US Army fight Aztecs from Space
[ Space Western 42 ]