So, I'm guessing even if Cap and Coulson take out the Joker and Harley they're gonna get interrupted by ninjas a little while after, right? Also guessing ninjas might help Spider-Man's player figure out what to do next and maybe give Rin a way into the story? Also if there IS an alien invasion noticing it and trying to slow it down as it enters earth could give GL something to do too, or he could always just beat down bad guys in an attempt to let other people in as well...

Also where's the guy playing Doctor Doom? If he showed somewhere doing...Doom-y things it could give us a whole 'nother scene for people to work with...