It’s possible that one of the other Mother Boxes will be revealed in the upcoming Wonder Woman movie, which hits theaters June 2, just five months before Justice League arrives November 17.
Hopefully we’ll find out more about these Mother Boxes as we get ready for Wonder Woman and Justice League to hit theaters this year.
It has also been rumored that Steppenwolf will be the main Justice League villain, with Darkseid appearing at the end of the movie, leading into the currently untitled Justice League 2 sequel.
These three civilizations are believed to have divided up an artifact into three parts, the Mother Boxes, which Steppenwolf is presumably coming for in Justice League.