If I was to make the following rumble:
Superman and Batman Vs Spider-Man and Iron Man
The correct (and very obvious) reply would be "Superman solos, Batman might as well not be there".
Can you think of any rumbles in which a team that has a powerful character (e.g. Superman) and a much weaker character (e.g. Batman) actually NEED the much weaker character in order to pull off the win?
Edit: I don't mean prep-based rumbles.