Captain Strong

I love crossovers. Even when they don't really work that well or make a whole lot of sense, it's almost always interesting seeing how characters that don't usually hang out bounce off of each other -- and it's especially fun when you've got a character like Superman. That guy's such a well-known, well-defined cultural institution that there has to be a huge temptation to see how he interacts with pretty much anyone else, even if you don't actually have the rights to do the real thing. But really, that's the magic of comics. Even if you can't get the genuine article, you can always file off the serial numbers and do your own version and get the same effect. Sort of. And that's how Superman ended up spending a good chunk of the '70s hanging out with Captain Strong, a thinly veiled stand-in for Popeye the Sailor Man who was addicted to alien seaweed.