A cancelled Batman film, Superman vs. Batman was going to be the fifth batman film untill it was confirmed it wouldn't happen. But after the cancellation of 2013s reboot of 1997s JLA (Justice League: Mortal), Christopher Nolan, the man incharge of both Batman and Superman, Is considering making Superman/Batman: the Movie (AKA Superman vs. Batman). It will possibly the fight of the decade, even better than 2003s Freddy vs. Jason and the DC comics horror comic book god-awful sequel, Freddy vs. Jason vs. Ash.
Despite the name THIS FILM WILL NOT BE BASED ON SUPERMAN/BATMAN the comic book but an issue of Batman that guest starred Superman where they fought. I'm not sure which one it was but you can buy the digital comic on www.dccomics.com/read
Based on the characters created by Jerry Siegel, Joe shushter and Bob Kane and writen by Grant Morrison.