And a bunch of superheroes kicking the shit out of each other.
The premise is this: After a battle goes awry, hundreds of innocents (and a few superheroes) die. This leads to a government movement to register all super-powered beings as living weapons of mass destruction. The subsequent Registration Act will divide the heroes into two camps, those for and (naturally) those against. A Civil War within the Marvel Universe begins.
As with all great arguments, there will be compelling reasons to be on either side. But the question remains...
Whose side are you on?