With the buzz that the OT cast are getting just from appearing in Days of Future Past, Fox would likely to bring them back most especially if DOFP ends up grossing more than $500 million worldwide.
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