In the words of Brad Pitt, "WHAT'S IN THE BOOXXXX?!" Because there isn't already enough going on with Batman and Superman being played off against one another, we then get a glimpse at Luthor's other side-plot, and confirmation that he's also a mad scientist. Unsurprising, the box contains a remarkably unbruised Zod. Dead as disco, but with his head on the right way.