The good mutants of the Xavier School will face their most powerful foe in 2016 when "X-Men: Apocalypse" hits theaters, and now we know exactly what that gray face will look like.

According to Variety, Oscar Isaac, who earned acclaim for "Inside Llewyn Davis" before jumping to the big time with "Star Wars: The Force Awakens," has reportedly signed on to play the villain role in the sequel to "Days of Future Past."

"Apocalypse" has been described as being a disaster movie more than a superhero one, and given the nature of the antagonist, that's not very surprising. Apocalypse -- or En Sabah Nur, as he was called in the mid-credit teaser on "DOFP" -- is history's first mutant, and he's basically a god. He can do anything from teleportation to energy manipulation.

Isaac will join returning cast members Jennifer Lawrence, Michael Fassbender and James McAvoy.

"X-Men: Apocalypse" opens in theaters on May 27, 2016.