In terms of sheer scale, Zack Snyder's Justice League arguably looks like it is going to become the biggest DC movie ever. The timeline of the film looks like it will span centuries, and it will feature some absolutely insane sequences that we would've never fathomed in other eras of DC movies. One such sequence involves the introduction of Steppenwolf's Mother Boxes, and Snyder has officially revealed the storyboards for that key sequence. Take a look at the sketches below.
Although they are definitely crude, these sketches are a key look into the mind of Zack Snyder as he envisioned Justice League during the film's development. The sequence in question (which Snyder posted on his Vero account) appears to show a flashback scene in which a group of knights buries a Mother Box to keep it from falling into the wrong hands. Of course, given the fact that it looks like the red skies are heading to Earth, it appears that nothing can stay hidden very long in the DC Extended Universe.
Based on everything seen in Zack Snyder's post, it looks like this particular sequence has already shown up in some of the Justice League marketing. Here's one of the shots from the Justice League trailer that debuted at San Diego Comic-Con 2016.
Moreover, here's another angle from this sequence, showing the knights burying the Mother Box.
This does not give us much to go by as far as concrete plot details go, but Wonder Woman may help shine some light onto the nature of the scene. The recent home release for Diana Prince's first solo adventure included a bonus scene in which everyone's favorite secretary, Etta Candy, recruited Steve Trevor's surviving teammates to recover one of the artifacts after World War I bombs uncover it in the Belgian countryside. The Justice League story will revolve around the quest to find the Mother Boxes before Steppenwolf (but apparently not Darkseid) can get his hands on them, so this sequence will likely serve to set up the importance of the artifact and provide some valuable backstory as to how and why the bad guys from Apokolips choose Earth.
Although one of them was briefly seen in Batman v Superman: Dawn of Justice, the Mother Boxes will make their official DCEU debut later this year when Justice League hits theaters on November 17. Looking beyond the highly-anticipated DC team-up film, take a look at CinemaBlend's comprehensive 2017 movie premiere guide, as well as our 2018 movie premiere guide, to see what other films are in store on the silver screen over the course of the next year.