Quick recap
With Superman dead, the three Mother Boxes awaken and draw Steppenwolf, who tried to conquer Earth millennia ago. He hits Themyscira and Atlantis and takes two boxes. Bruce Wayne and Diana recruit Barry Allen, Victor Stone and, after a refusal, Arthur Curry. Victor, whose body was rebuilt with the third box, hands it to the team. They use it to resurrect Superman, who comes back confused and attacks them until Lois Lane calms him. Steppenwolf grabs the last box and starts remaking Earth near an abandoned Russian town. With Superman back, the League corners him, and his fear draws his own Parademons, who carry him off. Clark returns to the Daily Planet.

