 Real Name
Real Name Sean Cassidy
Occupation
Adventurer; former paramilitary  commander, academic headmaster, carnival barker, subversive, criminal,  freelance operative, NYPD detective, INTERPOL inspector
 Citizenship
Ireland
 
Place of Birth
Cassidy Keep, County Mayo, Ireland
Known Relatives
Maeve Rourke Cassidy (wife, deceased), Theresa Rourke Cassidy (
Siryn, daughter), Thomas Cassidy (
Black Tom, cousin), Victoria "Tori" Donnely (Maeve's cousin), Liam Cassidy (ancestor, deceased)
 
Education 
Bachelor of Science degree from Trinity College, Dublin; police academy
Height
6'
Weight
170 lbs.
Eyes
Blue-green
Hair
Reddish-blond
Powers
Banshee's 
superhumanly powerful lungs, throat and vocal cords could produce a sonic scream for various effects, in concert with limited, reflexive 
psionic  powers which directed his sonic vibrations. He could hover or fly at  the speed of sound, and could carry at least one passenger. He could  overwhelm listeners with deafening noise, stun them with tight-focus  low-frequency sonic blasts (effective even against shielded ears by  penetrating the skull via bone conduction), plunge them into a hypnotic  trance, disorient them, nauseate them, or simply render them  unconscious. Using sonic waves, he could rapidly vibrate himself or  other masses at will. He could generate sonic blasts which struck with  tremendous concussive force, liquefying or outright disintegrating  targets at his highest levels of power. By radiating sound waves outward  and reading the feedback, he could locate and analyze unseen objects in  a sonar-like fashion. By modulating his scream's harmonics, he could  confuse most scanning equipment. He could instinctively analyze,  replicate, and block sonic waves or vibrations from other sources.  Banshee generated a psionic field which protected him from the  detrimental effects of his sonic vibrations, though his sonic powers  could still injure him when pushed beyond safe limits. His physiology  seemed fully vulnerable to conventional injury when his sonic powers  were not engaged. Banshee had selective hearing, enabling him to focus  upon, enhance, or totally block out any given sound in his environment;  this shielded him from the deafening sound of his own screams, and made  him a superhumanly acute eavesdropper in surveillance situations. Sean  and his cousin Black Tom were immune to each other's natural 
mutant energy powers, though Sean's immunity did not extend to the new powers Tom later developed via artificial 
mutations.
AbilitiesA  gifted detective, veteran undercover operative, and formidable unarmed  combatant, Cassidy was an excellent marksman and a competent amateur  machinesmith, well-versed in combat strategy & tactics and teamwork  drills. An effective educator, organizer and lobbyist, he was also an  avid American country music aficionado and skillful amateur piano  player.
Other InfoIreland's  storied Cassidy clan is an ancient and noble lineage. The family's ancestral home,  Cassidy Keep, was built by  Liam Cassidy over a thousand years ago to defend the Irish coast against  Viking raiders. In addition, Cassidy Keep covertly sheltered the  "Families" (diminutive enchanted leprechauns or elves). Born and raised  in Cassidy Keep, Sean Cassidy had a happy boyhood there, fantasizing  about fighting dragons and rescuing damsels. During adolescence, Sean  discovered his mutant sonic powers; however, he concealed them (partly  because his wail spooked the superstitious elders of the community, who  likened it to the ghostly banshees of Irish lore).
In  young adulthood, Sean had been hitchhiking home from a concert in  Northern Ireland when he was harassed by corrupt policeman who seemed keen on arresting Sean as a supposed terrorist,  despite lacking evidence. A passing motorcyclist named Maeve Rourke rescued  Sean; however, the policeman chased them across the Irish border and sent their  motorcycle off a cliff. This forced Sean to use his sonic scream to fly him  and Maeve to safety. Sean took Maeve back to Cassidy  Keep, where she adapted surprisingly quick to her discovery of Sean's  bizarre powers. Also, Maeve quickly grew fond of both Sean and his cousin 
Tom Cassidy, each  of whom was quite smitten with her. In fact, Maeve dated both cousins  for months, apparently genuinely torn between the two; however, she soon  realized that her heart belonged to Sean. But, she still considered Tom her  dearest friend. Stepping aside gracefully, Tom later served as best man  at their wedding; however, losing Maeve to Sean accelerated Tom's  gradual, secret descent into immoral, dangerous, and increasingly  criminal acts as he dabbled in mercenary work and various illegal  ventures. (To learn about Black Tom, click on the highlighted name  above.)
Meanwhile, Sean graduated college with a science degree  and eventually went into law enforcement as an agent of the  international police organization INTERPOL. During his time with INTERPOL, Cassidy hunted down the Russian  mutant serial killer Arkady Rossovich (the future 
Omega Red) with the aid of 
Magneto  and INTERPOL colleague Magrite Deveraux (who was slain by Rossovich).  In addition, he also teamed with fellow agent Daniel Peyer to infiltrate  the offices of mob boss Almadavor until the mercenary 
Deadpool  interfered, saving Sean's life but ruining the operation by killing  Almadavor.  (Click on the highlighted names above to learn about the  team and/or characters.)
Later, while Sean was on a long-term  assignment that kept him away from home with no contact for many months,  Maeve gave birth to their baby daughter 
Theresa.  However, both mother and child were soon caught in a terrorist bombing  and apparently killed. Sean had not known Maeve was pregnant. However, the baby girl had  secretly survived, and was rescued and adopted by her "uncle" Tom. When  Sean finally returned and learned of Maeve's death, Tom considered  telling his cousin the truth about Theresa, but a grief-crazed Sean  lashed out at Tom and blamed him for not protecting Maeve in his absence,  and accidentally gave Tom a crippling leg injury. Further embittered,  Tom decided to raise Theresa himself in secret. After this, Sean became an obsessive  workaholic and, perhaps hoping distance would help ease the pain, he  briefly transferred to New York City and joined the NYPD. (To learn about Siryn,  click on her highlighted name above.)
Soon afterward, Sean rejoined INTERPOL. And after years of international assignments, Sean came home to Ireland and led an  undercover operation targeting his cousin, Black Tom, who was now a  major criminal. Tom was caught and sentenced to life in prison.
Later, still mourning Maeve death, Sean actually quit INTERPOL for good and became a  freelancer, secretly dabbling in minor crimes. This  attracted the attention of 
Factor Three (a group of mostly mutant criminals), and their deputy leader 
Changeling  who tried to recruit Cassidy. When Sean refused, they forced him to wear a  remote-controlled explosive headband which would detonate if tampered  with. Therefore, Cassidy (code-named "Banshee") became enslaved and  performed criminal missions for Factor Three. In a bitter twist, Cassidy soon found  himself on INTERPOL's wanted list. Ultimately, Banshee was defeated by the 
X-Men,  who were able to free him from Factor Three's service. And later, with the X-Men's help, Banshee was able to bring down Factor Three and expose its "
Mutant Master"  leader as an extraterrestrial. (Click on the highlighted characters and/or team above to learn more about them.)
  
A diehard country music fan, Cassidy was in Nashville, Tennessee when 
Charles Xavier recruited him and several other mutants to form a new squad of X-Men to rescue the previous X-Men from the living island 
Krakoa.  After the successful completion of this mission, Banshee considered  leaving, since he felt too old for the mostly-youthful group; however, Xavier  and team leader 
Cyclops  convinced him to stay. (To learn about the characters above, just click  on their names. Note: Beware of the revealing/form-fitting outfit worn  by Emma Frost on Cyclops' bio page.)
Being of similar age with Professor X, Banshee  sometimes served as a confidant of sorts to Xavier. And, being one of the  new team's more experienced and stable members, he occasionally assumed  an informal leadership role in the absence of Xavier and Cyclops. (The  team's foremost foe, Sean's former ally Magneto, once referred to the  formidable Banshee as the only worthy opponent among the new X-Men).  It was also during this time, that Banshee began a long-running romance with Xavier's silent partner,  geneticist 
Moira MacTaggert. (To learn about Moria MacTaggert, click on her highlighted name above.)
When Sean finally inherited his family's estate, he and the X-Men were  ambushed at Cassidy Keep by a vengeful Black Tom and his new ally 
Juggernaut--both of whom had been paid to destroy the X-Men by 
Shi'ar agent 
Eric the Red.  The X-Men defeated the villains with the aid of Cassidy Keep's  leprechauns. (Click on highlighted names above to learn about the  characters and/or race.)
After many more adventures with the X-Men, Banshee burned out his sonic powers while saving Japan from destruction by 
Moses Magnum. Sean continued to assist the X-Men as best he could, notably aiding them against Moira's murderous mutant son, 
Proteus. Realizing his injuries might be permanent and knowing Moira needed him, Sean retired from the X-Men and moved into Moira's 
Muir Island  research complex, where he convinced a grieving Moira to abandon plans  to resurrect her monstrous son. (To learn about the characters and/or  place above, just click on their highlighted names,)
Sean Cassidy lived a mostly quiet life for the next several years, though his lack of super-powers did not stop him from assisting  the X-Men on occasion in various support capacities. In fact, it was through this, that Sean  finally met his daughter Theresa--now the young adventurer "Siryn." Her  true parentage was belatedly revealed to both Sean and Theresa by Black  Tom. It was a joyful discovery for both, but Sean's complete absence  from Theresa's early life has occasionally made their relationship an  uneasy one.
Later on, Banshee teamed up with 
Jubilee, 
Emma Frost, and a reluctant 
Sabretooth to rescue a group of mutant teens from the extraterrestrial 
Phalanx. One of the teens, 
Blink,  sacrificed herself to make the victory possible. The survivors, Jubilee,  and various other young mutants all enrolled in Xavier's new youth  education program at the 
Massachusetts Academy,  with Sean and a newly reformed Emma as co-headmasters. Cassidy and  Frost worked together uneasily at first, and experienced several severe  falling-outs, but gradually forged a mutually respectful working  relationship and a strong bond with their students, 
Generation X.  (Click on the highlighted names above to learn about the characters,  place, and/or team. Note: Beware of the really revealing and/or  form-fitting outfits on Emma Frost's bio page. Also, Banshee when he was headmaster of Generation X is shown in the forth picture posted.)
Sometime later, Moira MacTaggert placed herself in quarantine after contracting the 
Legacy Virus, and she eventually died when 
Mystique  bombed Muir Island. Sean took the news hard and began drinking  heavily. This alcoholic downslide eventually lead to the disbanding of  the Generation X program.  (To learn the virus and/or character above  just click on their names. Note: Beware of the revealing outfit worn by  Mystique on her bio page.)
After this, Sean retreated back to Ireland, quit drinking, and channeled  his grief into creating and leading the  international paramilitary mutant police force known as the 
X-Corps.  Banshee recruited various volunteer mutant adventurers (including  former Generation X students). He also pressed criminal mutants into X-Corps  service through the mental powers of captive criminal mutant mentalist 
Mastermind. However, it was later revealed that Mastermind was secretly working for Mystique when one day,  Mystique infiltrated the group, freed the criminal members from  Banshee's control, slit Banshee's throat, and tried to take over the  Corps. However, the X-Men and the benevolent members of X-Corps soon  halted the freed criminals' rampage, and a wounded Banshee managed to  defeat Mystique with the aid of 
Abyss.   Unfortunately, Banshee was stripped of his sonic  power by his injuries. (To learn about the above highlighted team and/or  characters, just click on their highlighted names. Also, Banshee as leader of the X-Corps is shown in the fifth picture posted. Note: Beware of the form-fitting outfit on Mastermind's bio page.)
Banshee had  barely begun to heal, both emotionally and physically, when he uncovered  vital information regarding the recent disappearance of Charles Xavier.  Unwilling to entrust this information to electronic communication, he  flew back to America via commercial aircraft, but 
Vulcan had seized control of the X-Men's 
Blackbird  jet and set it on a collision course with Sean's plane. Healed enough  to fly short distances under his own power, Banshee exited the plane and  could have flown to safety, but instead tried to save his fellow  passengers by sonically deflecting the Blackbird. However, the injured  Banshee lacked the power to accomplish this feat, and was caught between  the two planes in a mid-air explosion, sacrificing himself to  protect innocent human lives. (To learn about Vulcan and/or the  Blackbird, just click on the highlighted names above.)
Recently, Banshee was revived with an alien techno organic virus.
To learn more about Banshee, just click on the following link, 
http://marvel.com/universe/Banshee.