It’s a call back to the helmet Maximus Decimus Meridius wears in the first movie which will presumably have a cameo in the sequel. It’s also what rapper MF Doom’s iconic mask is based on.

Doomsday is coming (no, not the MF DOOM song), as the upcoming Avengers movie, appropriately titled Avengers: Doomsday, finally has a production start date after months and months of anticipation.