Early Life

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Siryn

He then learned of his daughter's existence. Theresa has become Siryn, inheriting her father's powers. She had thought Tom was her father, and she was overjoyed to learn of her real father's existence. Tom has become Black Tom Cassidy, a criminal. Siryn felt she needed to help Tom with crimes, but Sean reformed her and she became his partner. He rejoined the X-Men, but they soon put him in position as the mentor of Generation X. Generation X was a short-lived team that he and Emma Frost led for a short time. It eventually broke up, but had consisted of teenage mutants like Decibel and Skin.

X-Corps

After Generation X, Banshee was saddened because Moira MacTaggert died(killed by Mystique). He founded the X-Corps, a more violent branch of the X-Men that is more dangerous and affiliated with former criminals from Magneto's Brotherhood Of Evil Mutants.

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Death

During the X-Men mini-series, Deadly Genesis, Banshee was contacted on Muir Island by Beast, asking if Moira had any old files that might have given them and idea about where Charles Xavier had disappeared too. He finds nothing, but as their sonversation is about to end, Banshee sees a figure through the window, and runs out, believing it to be Moira.

He follows "Moira", and she leads him to a cabin where she opens the door, and then she fades into thin air. Banshee enters the cabin, where a computer is switched on. He pulls a CD out from the shelf marked "Charles Xavier's Notes: Important". He plays the tape, and for an unknown reason at the time, we see Moira bad mouth and curse about Charles Xavier.

Banshee then catches a plane to America, and on the plane, he speaks to Nightcrawler who's at the mansion, and explains that he doesn't know what it means (talking about the CD). Vulcan is listening in on their conversation from the Blackbird, and Nightcrawler and Wolverine leave the mansion to go and pick Banshee up.

Banshee gets his luggage from the over-head compartment, and just as he's about to leave the flying plane (presumably he was going to fly out of it to Nightcrawler and Wolverine who are waiting for him just outside the airport). Someone behind him then spots a jet, and Banshee notices that it's the Blackbird and can see that it's going to hit them. He quickly takes off his over-clothes to reveal he has his suit on underneath, and opens a door on the plane that's facing the Blackbird.

He jumps out of the moving plane and tries to use a sonic scream on the Blackbird to stop it, but because his voice is till damaged, he is unable too. and the two planes collide. Banshee smashed through the window screen of the Blackbird.

His body was later buried at the Institute next to Sway and Petra. His grave reads:

"Sean Cassidy

Banshee

Beloved Comrade"

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Inheritance

Before Banshee died, he filmed a video for his daughter, Siryn, explaining that Cassidy Keep is now her's and he wanted to leave her something else, something special his father left him: an old pipe.

In other media

In the movie Banshee runs the Xavier's School for Gifted Youngsters with Emma Frost. Sean is much more laid back in his teaching approach than Emma, and wants to make sure that the students bond as a team. In the movie he can produce a sonic scream that can stun people. While multiple sources have listed Jeremy Ratchford as the voice of Banshee in the X-Men Animated Series, he has said in interviews that he did not provide Banshee's voice in the cartoon.

Characteristics

Gender - Male

Height - 6'

Weight - 180 lbs

Eyes - Blue-green (Hazel)

Hair - Reddish-blonde

Powers and Abilities

Banshee's mutant power was his ability to generate huge amounts of sonic energy using his voice. This 'sonic scream' had a variety of uses. Banshee could use it to fly, create concussive or desintigrating energy blasts, create force-fields, shatter certain materials by using different wavelengths of sound, or cause his enemies to become disoriented, nautious, or even unconcious. He could even use sonic pulses to let him move very fast.

Alternate Versions

Age of Apocalypse (Earth-295)

In this reality, Sean is a member of the X-Men, albeit retired. But Magneto convince him to to joined the fight against Apocalypse. He has proven to be a valuable ally, as he fought the horseman Abyss twice, the latter confrontation of the two being their last, as Banshee sacrificed himself to destroy the horseman.

House of M (Earth-58163)

In this reality, Banshee is the member of the Marauders, the Genoshan black ops team.