From the PlanetXbox360.com feature list:
"The fighting game demographic has been treated to some of the best crossovers in recent years. Fighting fans have gotten Mortal Kombat vs. DC Universe, Ultimate Marvel vs. Capcom 3, and this week they’ve gotten Street Fighter X Tekken, but what about all those millions of other gamers? The only crossover games we get are from the Mario & Sonic at the Olympic Games series, and frankly that isn’t doing it. Lets face it. Big name franchises don’t want to tarnish their names by crossing over with another video game series, so why bother thinking about what could have been? You mind as well think about what will never be, which is why we’ve compiled the list below of the Top 10 most unlikely video game crossovers."