Banshee (Sean Cassidy) is a fictional character, a Marvel Comics superhero who operates as a member of the X-Men.
An Irish mutant, Banshee possesses a "sonic scream," capable of harming enemies’ auditory system and causing physical vibrations. He is named after the banshee, a legendary ghost from Irish mythology, said to possess a powerful cry, although the banshee spirit is invariably female.
A former Interpol agent and NYPD officer, Banshee was always a decade older than most of the X-Men and had only a relatively short tenure as a full-time X-Man. He was, however, a mentor of the 1990s-era junior team Generation X.
Created by writer Roy Thomas and artist Werner Roth, Banshee first appeared in X-Men #28 (January 1967).
Read more about Banshee at Wikipedia ...
Official Site: Marvel Entertainment
Links: Banshee Entry At Wiki Banshee Bio At Uncanny X-men Cry Out: The Banshee Fan Site