Superman in the Marvel Universe

I remember seeing ads for Superman Vs. Muhammad Ali when I was a kid, and being fascinated by it.  Treasury-sized comics were a rarity at the time and it was cool to see that the great artwork of Neal Adams was going to be presented in such a large format.  Plus, superman was teaming up with a real life guy, probably the most famous sports figure of the time.  I thought that was so crazy that I just had to read the story to find out what was up.  That turned out to be a long wait because I never saw a copy on sale.  It took decades and the invention of the internet before I tracked down a copy.  The story is just as nuts as I was expecting it to be, and the Adams artwork was gorgeous - well worth the wait!