I'm totally interested! I'll probably have an original character. Going to lurk a bit to see if this picks up traction. 

I can't really think of how the two universes collide aside from one major being wanting to muck about in each universe and The Living Tribunal/The Presence thinks the only way to make things right is to have heroes (and maybe villains?) from each work together. Gathering all major artifacts, amassing an "army" to confront one of the major baddies (or both at the same time) and after they defeat one they now possess the power to wreck the other with all the major artifacts [i]and[/i] whatever gave the now defeated bad-person the ability to cause such havok. 

But I'm just spitballin' here.