28,000 years ago, the Apokoliptian general, Steppenwolf and his army of Parademons attempt to conquer and remake Earth through the combined energies of the Mother Boxes before they are all foiled by a unified army that included the Olympian Gods, Amazons, Atlanteans, humans, and Green Lanterns. After repelling Steppenwolf's army, the Mother Boxes are separated and hidden in locations around the world. In the present day, the world is in mourning following the death of Superman. Sensing humanity's fear, Steppenwolf and his Parademons succeeding in returning to planet Earth to resume their hunt for the Mother Boxes through kidnapping several employees of S.T.A.R. Labs, which is in possession of one box. Having investigated the kidnappings and encountered a Parademon himself, the billionaire vigilante Bruce Wayne has decided to move forward in recruiting his planned team of metahumans as he believes an invasion is coming.