Like most superheroes, the X-Men and Avengers have come to blows over the years. However, the rivalry between the two factions came to a head in the appropriately titled Avengers Vs. X-Men event series. When Earth's Mightiest Heroes attempted to take one of their own, Cyclops struck the first blow against Captain America and the war was on! Though Marvel were clearly hoping readers would side with The Avengers, the majority ended up rooting for the X-Men, and they emerged pretty much victorious after using the Phoenix Force to make the world a better place...until The Avengers screwed everything up.