Source: comicattack.com

6. Batman/Hulk

I love the weird crossovers. The ones that don't seem to make any logical sense on first, second, or even third thought, but somehow wind up being excellent.

It actually isn't that hard to explain the genesis of this one. Back in the late seventies, Marvel and DC had already made two Superman/Spider-Man crossovers and had decided to expand into other characters. Picking the next two characters to team-up was an imperative. But DC and Marvel opted to go with their second most popular characters at the time. And due to the Adam West Batman and Lou Ferrigno/Bill Bixby Hulk television shows, those characters were easy to pick.

The story itself focuses on The Joker teaming up with hyper-obscure Marvel Villain The Shaper of Worlds to acquire a new gamma weapon. Batman and the Hulk fight each other for a while, of course, before joining forces to save the world.

It's another enjoyable story, plus it has Killer Moth in it, so I obviously love it.