“I was writing it as a singular story and some of other writers asked with the Bat-characters in particular, if they might be able to show where their characters were during this kind of seminal moment in the story, when Gotham is at a very dangerous moment,” Snyder told Parallel Worlds.
“And so I said, ‘Look, if you guys want to do it, you know, we’re all friends, I’m not gonna say no,’” he said. “So there will be some tie-ins with some of the books you would expect.
“I’m really, really happy that they wanted to do it just because we are really close, all of us working on the Batbooks and it’s fun when they say ‘We’d like to tie in and show where our characters are’ … I’ll never say no to that when they ask.
DC Comics won’t say which titles will be involved just yet, but it doesn’t take a genius to guess that we’ll be seeing the likes of “Nightwing”(Dick Grayson), “Batgirl” (Barbara Gordon), “Teen Titans” (Red Robin/Tim Drake) and “Red Hood and the Outlaws” (Jason Todd) involved.
“This is an opportunity for them to show where their character is … and to give you a secret moment from the history of that character that you might not have seen before,” Snyder said.