Fox considered doing a film that pitted the X-Men against the Fantastic Four.
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Comic writer Warren Ellis was hired to write a treatment.
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Warren Ellis has written for DC, Marvel and Image Comics.
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Details about his treatment are unknown at this time.
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Ashley Edward Miller and Zack Stentz also wrote an X-Men vs Fantastic Four film.
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It would've been similar to Mark Millar and Steve McNiven's Civil War.
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A planned post-credits scene set up a set up a Skrull invasion.
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Marvel Studios now holds the rights to both teams.
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