The Parademons already showed up once during the Knightmare sequence in Batman V Superman, so Bruce Wayne has finally started to realize that his worst fears may be coming true.
We still don’t now much about the overarching plot of Justice League, but the quick glimpses that we see in this teaser lead us to believe that the film will borrow liberally from the New 52 Justice League origin story.
With the forces from Apokolips barreling down on Earth, Batman and Wonder Woman will recruit the various superheroes from Lex Luthor’s (Jesse Eisenberg) metahuman registry to protect the planet from an intergalactic threat.