Who is the Bald Villain in Deadpool and Wolverine?

Her name is Casandra Nova

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She is the Twin Sister of Charles Xavier (Professor X)

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She is not technically a Mutant or a Human. She is a Parasite known as Mummudrai

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Parasitic Cassandra first encountered Charles Xaviers when he was in the womb

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and copied his DNA including his Mutant abilities to help create her own body

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In the comics, once Cassandra destroyed an entire island (Genosha) eliminating 16 million Mutants in a matter of minutes.

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