Okay so Prof takes MM to the astral plane to battle him there..
Flash would cause all sorts of problems though. Surfer would have to open up another dimension while he's running around and trap him there.
Bats is versatile but he's no match for Stark's arsenal.
Namor and Aquaman duke it out, while Wonder Woman and Hulk fight. I think she eventually wins.
Dr. Strange meanwhile has summoned a hoard of demons to battle Green Lantern which he dispatches fairly easily. He then unleashes the full power of Cyttorak himself to destroy him.
At this time Supes and Black Bolt have taken their fight into the stratosphere. They trade punches, but BB soon finds out Supes is much too powerful for him. He then delivers the master blow. That doesn't kill Kal, so he utters a full sentence which shakes the very heavens, effectively knocking Superman out.
Aquaman and Wonder Woman are left to fight the collaborative efforts of the Illuminati and the Defenders. Dr. Strange magically controls her lasso and chokes her to death with it. Aquaman flees from fear.
I think that settles it. I think I should add Cpt Marvel to make it fair.