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Sean Cassidy was a mutant human from the 1990s of a parallel reality. He was a native of the country of Ireland. Due to his mutant ability (a "sonic scream") he used the codename "Banshee." Cassidy served as a member of the team known as the X-Men, plus he also was known as a teacher. (TNG comic: "Second Contact")
|L. Bishop (Bishop) • S. Cassidy (Banshee) • J. Grey-Summers (Phoenix) • R. Lebeau (Gambit) • J. Howlett (Wolverine) • H. McCoy (Beast) • O. Munroe (Storm) • J. Proudstar (Thunderbird) • K. Pryde (Shadowcat) • P. Rasputin (Colossus) • S. Summers (Cyclops) • K. Wagner (Nightcrawler) • W. Worthington III (Angel) • C. Xavier (Professor X)|