While much of the plot of Justice League has been kept under wraps, we do know that the villain Steppenwolf is looking to get his evil hands on three Mother Boxes, which have been separated between humans, Atlanteans and Amazons following an ancient war against the forces of Apokolips.
We got a brief glimpse of a Mother Box during the creation of Cyborg scene in Batman v Superman: Dawn of Justice, and the Justice League trailer showed another being buried. But for those not familiar with the concept of the Mother Box, Ben Affleck has been explaining what they are, and how they factor into Steppenwolf’s plan.
“A Mother Box is an all-powerful, indestructible, technological cube that can also teleport a bunch of aliens to Earth from another world,” said Affleck. “Once you combine the three Mother Boxes they form what’s called the Unity, a force that is pure power used to conquer worlds. Fortunately, these things don’t exist in real life, of course, but they’re a part of the DC Universe, and a problem for the Justice League.”
Fueled by his restored faith in humanity and inspired by Superman’s selfless act, Bruce Wayne enlists the help of his newfound ally, Diana Prince, to face an even greater enemy. Together, Batman and Wonder Woman work quickly to find and recruit a team of metahumans to stand against this newly awakened threat. But despite the formation of this unprecedented league of heroes—Batman, Wonder Woman, Aquaman, Cyborg and The Flash—it may already be too late to save the planet from an assault of catastrophic proportions.
Justice League will reunite Batman v Superman: Dawn of Justice stars Henry Cavill as Superman, Ben Affleck as Batman, Gal Gadot as Wonder Woman, Ray Fisher as Cyborg, Jason Momoa as Aquaman, Ezra Miller as The Flash, Amy Adams as Lois Lane, Jeremy Irons as Alfred Pennyworth, Diane Lane as Martha Kent, Jesse Eisenberg as Lex Luthor, Connie Nielsen as Queen Hippolyta and Robin Wright as General Antiope alongside J.K. Simmons (Whiplash) as Commissioner Gordon, Amber Heard (The Danish Girl) as Mera, Willem Dafoe (Spider-Man) as Vulko, Kiersey Clemons (Dope) as Iris West, Ciaran Hinds (Game of Thrones) as Steppenwolf, and Julian Lewis Jones (Stella) and Michael McElhatton (Game of Thrones) in as-yet-unrevealed roles.