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Crossovers. Like easter eggs and in-jokes, they play to the part of our movie-lovin' hearts that makes us feel like we're privy to something cool. Whether it's a big film crafted solely around a titular battle, or a sneaky character cameo, the result is the same: a cinematic hybrid.
A little like Frankenstein, parts drafted in from all over the place to create something brand new, the crossover is on the rise. Next year sees the release of Batman vs Superman, and if recent rumors hold a shred of truth we'll be getting an X-Men/Fantastic Four team-up film in the future. Before either hits the big screen, read our rundown of ten of the coolest film crossovers.