Mark Millar once said in his short lived stint as a writer that in the mid nineties, Marvel and DC were in talks to have two of their medium selling characters (Daredevil and Wonder Woman respectively were named dropped) switch universes for a year. DC character X would now be residing in the Marvel Universe and their monthly escapades would be written, drawn, colored, lettered, edited by faculty of Marvel Comics. Same for the Marvel character in question, but in reverse.

If this actually happened, and it happened today, how would you go about it? Which Marvel and DC characters would switch universes. What would plot elements be? Who would be the creative teams? Go crazy.