5. World's Finest
The profitable potential of Superman and Batman sharing the same screen is immense no matter how it is conceptualized. Whether it is dreamt up as a team-up, or staged as a colossal battle of titans - or better yet, both - The Dark Knight and Kal-El sharing the screen in the inevitable sequel to Man Of Steel would not only give the film an immediate Avengers-like buzz surrounding it while only putting up Warner Bros. two greatest and profitable superhero franchises together. It would also introduce the rebooted new Bale-less Batman to DC's still infant cinematic universe, and simultaneously be the launching pad to even greater money-reaping Justice League film, having already introduced two of the core three members.