(Before you do though, be warned, this trailer pretty much spoils the entire movie. Hollywood sucks.)
(Seeiously, don't watch past 2:24)
While the presence of Clark Kent, Bruce Wayne, Lex Luthor, and Wonder Woman were all expected, the appearance of Doomsday was not. There had been rumours that the monstrous creature might be the main villain for the superheroes to team up against, but they were never confirmed--until now.
In an interview with Variety last month, Batman star Ben Affleck spoke about the need for the movie to be a big hit, following a disappointing year at the box office for DC's parent company Warner. "I think there is a ton of pressure on it," he said. "I mean I would be bullsh**ting you to say there isn't."
"You'll see next year they are going to have a great year," he continued. "They are now developing probably the single greatest under-exploited IP asset in the entertainment business, the DC comic world. And now they have started to exploit that and you are going to see that blossom. And, when it does, it's going to be massive.
"Nonetheless, there's a lot of pressure on it. If it doesn't do well, that will be extremely disappointing."
Batman v Superman: Dawn of Justice will open on March 25, 2016. It also stars Henry Cavill, Amy Adams, Jesse Eisenberg, Diane Lane, Gal Gadot, and Laurence Fishburne.