Stephen Wolfe is monster looking warrior from other world who just wants to invade Earth for his own personal reasons. Dark Side is an evil tyrant lurking in shadows of different side of universe. This film also works as an origin story for Cyborg. He is struggling to find his place in the world torn apart between his human and mechanical identity. Batman became a hero again after spending years in rage and hate. Here he is a hero and leader who is honoring Superman after his death via defending this world