Source: marvel.wikia.com
4. Superman/Silver Surfer
This one's a weird pairing, but one that I really enjoy.
In the story, the hyper-powerful imps of the Marvel and DC universes (the Impossible Man and Mr. Mxyzptlk, respectively) challenge each other to a trick-off. Each one will go bother the other's arch-nemesis, and whoever pulls the best trick wins. And so our story is mostly composed of Superman and the Silver Surfer being just super annoyed.
The high point comes when Impossible Man and Mxyxptlk start to fight with each other by rapidly shapeshifting into various Marvel and DC heroes and villains in a high octane version of rock paper scissors. Superman and the Silver Surfer are actually a better match than you'd think. The Surfer's cold detachment is a nice counterpoint to Superman's kindness and humanity.
Unlike many of the crossovers we're gonna talk about, this one isn't a "worlds at stake" actionfest. Hell, Supes and the Surfer don't even fight, but that's for the best. It's a fun little story, and its relative smallness earns it its charm.
