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Weapon X: Biographical Information On Known Mutants
Much is unknown about the mutant Elisabeth 'Betsy' Braddock aka Psylocke. She was an original member of Callisto's group, and later joined forces with Magneto to fight against the mutant "cure".

Besides being a telepath, Betsy has the psionic ability to create a "psychic knife", and can fade into the shadows. She was thought to be killed by Jean Grey at Alcatraz, but has been sighted months after the incident.