When Warner Bros. announced at Comic-Con 2013 that their sequel to Man of Steel will feature both Bruce Wayne and Kal-El, they did so by enlisting actor Harry Lennix to read the following line from The Dark Knight Returns, which was adapted into a two-part animated movie last year.
"I want you to remember Clark. In all the years to come. In all your private moments. In all the years to come, my hand at your throat. I want you to remember, the one man who beat you."
Although he wouldn't confirm that Batman Vs. Superman is a direct adaptation of The Dark Knight Returns, Zack Snyder did hint that the comic book will influence the story they are telling.
"The comic book will influence the history of Batman Vs. Superman, on which the writer David S. Goyer and myself will work."
The filmmaker also went onto to speak about the most controversial, and often discussed aspect of the movie: Why Ben Affleck was the right actor to play an older Bruce Wayne/Batman.
"Ben brings an interesting counterweight to the performance of Henry (Cavill) in the role of Superman. He has the experience necessary to paint the picture of an older and more advised man than Clark Kent, who bears the scars of a seasoned vigilante while retaining the charm that Bruce Wayne deploys when present in the world."
Production will begin in Detroit this spring on Batman Vs. Superman, which also stars Amy Adams (Lois Lane), Diane Lane (Martha Kent), Laurence Fishburne (Perry White), Gal Gadot (Wonder Woman), Jesse Eisenberg (Lex Luthor) and Jeremy Irons (Alfred Pennyworth).
Batman Vs. Superman comes to theaters May 6th, 2016 and stars Henry Cavill, Ben Affleck, Amy Adams, Diane Lane, Laurence Fishburne, Gal Gadot, Jesse Eisenberg, Jeremy Irons. The film is directed by Zack Snyder.