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The New Mutants Originally Featured Post-Credits Scene With Jon Hamm As Mister Sinister

The number of X-Men movies is now up to nine, 10 if you are going to count Deadpool, with multiple more on the way. Across those films, we've seen many different villains like Magneto and more recently Apocalypse, but one that has not actually shown up is Mister Sinister. It sounds like he was finally about to be in the upcoming The New Mutants, with him even being cast, but it ended up being cut.