crazy facepaint - maybe shot in various goth bars in New York. They might give out night vision glasses so you can see the characters for the few brief seconds one of them isn't wearing all black. All the characters will have emotionally tragic pasts, and the villains will all be made out to be tragic but redeemable creatures with big hearts and all misunderstood, and all that. And then, all of the sudden, they will go into an alternate universe and have to fight together to beat back some pirates of the Caribbean characters that accidentally landed in a time warp created through a giant hurricane. Seems likely.
And people will be like - Oh my gosh, there's totally this whole other universe out there - never saw it coming. Can't wait for the next round of this! What if Batman faces Ben Hur, or Cool Hand Luke, or Perseus from Clash of the Titans - mind blown!