My idea and cast for the sequel
Mr Freeze as the main villain, his origin, was happily married to Nora Fries, but she became I'll, he tried to fast track his research to help find a cure, however, the Riddler had started the flood in Gotham, which destroyed Fries lab which had an experimental sub-zero substance he had developed, spray him, altering his appearance. Sometime later, he begins terrorizing Gotham.
Cast
-Robert Pattinson as Bruce Wayne/Batman
-Michael Fassbender as Victor Fries/Mr. Freeze
-Zoe Kravitz as Selina Kyle/Catwoman
-Jeffrey Wright as Commissioner James Gordon
-Oliver Jackson Cohen as Harvey Dent (the last movie pretty much set him up to be the new DA without mentioning)
-Rebecca Ferugson as Nora Fries
-Jayme Lawson as Mayor Bella Real
-Giancarlo Espositio as Lucius Fox
-Colin Farrell as Oswald Cobbleott/Penguin
-Andy Serkis as Alfred Pennyworth
-Michael Stuhlberg as Ferris Boyle