Hmm as much as I want to see Apocalypse, I think they should do a build-up movie for him first, before appearing full-time. Kinda like what Marvel is doing with Thanos and what Sony is doing with the Green Goblin.
WOLVERINE X CYCLOPS X STORM X ROGUE X ICEMAN X PROFESSOR X
X-MEN - FANTASTIC FOUR
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MISTER FANTASTIC 4 INVISIBLE WOMAN 4 THE THING 4 HUMAN TORCH