Pitting the Man of Steel against the Dark Knight might seem like a no-brainer, but according to Batman V Superman: Dawn of Justice director Zack Snyder, the crossover was originally just an easter egg idea for 2013's Man of Steel. In an interview with Entertainment Weekly, the three-time superhero movie director reveals the first discussion of bringing Batman into the same cinematic universe as Superman's was in a planning meeting for Man of Steel with executive producers Christopher Nolan and David S. Goyer.
"I said, ‘What about at the end of the movie we do a scene where there’s a crate full of kryptonite delivered to Wayne Manor,’” Snyder tells EW. “Everyone was like…‘Okaay.’ Once you say it out loud it’s a problem because you can’t unsay it.”
Although several easter eggs madee it into Man of Steel, that one didn't make it past that initial meeting but did go on to inspire the upcoming movie -- and nix their original plans for the villain for the Man of Steel follow-up.
"I remember talking about 'What's the next villain?'" said Snyder in a portion of the interview in the EW print edition. "We can't do another alien invasion.' Brianiac was definitely down the road. Metallo, I think, was going to be the main bad guy of this movie."
Snyder said that while Brainiac and Metallo might be featured 'down the road,' his next film is 2017's Justice League, Part 1. Although Batman V Superman: Dawn of Justice is still several months away, Snyder reveals that he and Chris Terrio, who wrote Argo and a re-write of Batman V Superman, have already completed that movie's script.
Batman V Superman: Dawn of Justice is scheduled for release March 25, 2016.