Zack Snyder recently talked with the Daily Beast and explained the inclusion of Doomsday in the latest trailer for Batman V Superman: Dawn of Justice. “We had a long conversation about just taking ownership of that, of giving it to the audience in a controlled way that I felt was consistent with the escalation of the campaign,” Snyder said. “To us it really made sense to give [Doomsday] to the audience now. I really wanted to make the audience a promise that… though I’m super excited and happy and fulfilled by the conflict of Batman and Superman, there’s also a bigger world to start to think about.”
Snyder was also asked about his comments, teasing a “bigger enemy to fight” in Justice League and said, “Well, you have Doomsday, right? He doesn’t just crawl out of the ground. He has his own mythology, right? So that has to be explored…”