The 10 Greatest Video Game Series Mash-Ups

There's something ridiculously enticing about the merging of fictional worlds, especially when it comes to video games. Maybe it's the immersion factor, making players feel like they have a personal stake in their favorite games; stakes that never seem higher than when those disparate worlds are brought together.

With Street Fighter X Tekken, possibly the most epic fighting game crossover ever, just over the horizon, we thought it might be an appropriate time to reflect on our favorite gaming mash-ups of all time.