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Y'know, Wolvie, back then I felt that screamin' baggarts like yourself deserved a bad end. But, indeed, sometimes a bit o' noisy bravado can get the job done... as I do, while callin' myself Banshee!
~ Banshee to Wolverine.
Saints preserve me... l-l-lad, ye're a... mutant?!
~ Banshee.

Banshee also known as Sean Cassidy is a fictional character and superhero from Marvel comics, appearing as a supporting character in the X-Men series.

An Irish mutant, Banshee possesses a "sonic scream", capable of harming enemies’ auditory systems and causing physical vibrations. He is named after the banshee, a legendary ghost from Irish mythology, said to possess a powerful cry. A former Interpol agent and NYPD police 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 a mentor of the 1990s-era junior team Generation X, and later became the founder of the X-Corps.

He was created by Roy Thomas and the late Werner Roth, and first appeared in X-Men #28 in January of 1967. Since his debut, he has appeared in numerous media, being played by Caleb Landry Jones played in 2011's X-Men: First Class.


Early Life

Sean Cassidy was born in County Mayo, Ireland to unnamed parents, and his lineage to the Cassidy family made him the heir of to Cassidy Keep. With his new fortune, Sean went off to Trinity College where he earned his bachelor degree of science, and later learn of his mutant power to cause sonic vibrations with his voice. He demonstrated this ability when saving Maeve Rourke from the police, and developed romantic feelings for her. Sean also started to compete with his cousin Tom for Maeve's affections, but Maeve would choose Sean over Tom. The two would later get married, but Cassidy would become an Interpol agent, leaving Maeve to give birth to their daughter Theresa by herself.

Becoming Banshee

Sean would later learn of Maeve's death from a bombing, but wouldn't learn of Theresa since his cousin Tom got custody and raised her himself. Though Sean initially tried to escape his anguish by doing countless Interpol missions, but he would turn to a life of crime that dodged the authorities. Cassidy would get himself intertwined with the Factor Three, being forced to do their bidding when they strapped explosives on his headband. Given the code name "Banshee", Sean came across the X-Men and Professor X removed the headband, allowing Cassidy to help them stop the Factor Three's leader Mutant Master. Afterward, Banshee joined the X-Men, being first sent to stop the sentient island Krakoa.

During his early tenure with the X-Men, Cassidy met Professor X's colleague Moira MacTaggert, and developed romantic feelings for her. When the X-Men traveled to Japan to stop Moses Magnum, Banshee used his voiced to stop Magnum from causing earthquakes, at the cost of his vocal cords. After battling Proteus, Cassidy relized his feelings for MacTaggert, and decided to retire from the X-Men and began a relationship with the doctor. He briefly returned to the team to help them fight off Arcade, and later met his daughter when Tom Cassidy attacked the X-Men with Juggernaut. When the X-Men were kidnapped by the Phalanx's, Banshee worked with Emma Frost to save mutants, and later became the co-headmaster of xavier's institute.

Following the disbandment of Generation X and Moira's "death", Cassidy turned to alcoholism, but returned to form the X-Corps to make up for his past mistakes. The team didn't last long, as the corps was infilitrated by Mystique and attempted to kill Cassidy, but she was stopped when Banshee unleashed Abyss. Though his throat healed from Mystique's attack when she joined X-Corps, he could no longer use his powers. During a mission after M-Day, Banshee was killed when he was rammed by a blackbird jet, and he was buried at the Xaver institute.



  • In Generation X, he was portrayed by Jeremy Ratchford.
  • In X-Men: First Class, he was portrayed by Caleb Landry Jones.

Video Games

  • In X-Men Legends II: Rise of Apocalypse, he was voiced by Quinton Flynn, who also voiced Silver the Hedgehog in the Sonic series, Raiden in the Metal Gear Solid series, Marcus Damon in Digimon Data Squad, and Axel in Kingdom Hearts.



  • Both Roy Thomas and Werner Roth created Banshee as female, but Stan Lee told them that female villains weren't popular.
    • Thomas also noted that Siryn's design is what Banshee was originally going to look like.


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Archangel | Anole | Armor | Banshee | Beast | Broo | Bishop | Blindfold | Boom-Boom | Cable | Caliban | Callisto | Cannonball | Chamber | Changeling | Charles Xavier | Cypher | Colossus | Cyclops | Darwin | Dazzler | Dust | Elixir | Emma Frost | Fantomex | Firestar | Forge | Gambit | Gentle | Graymalkin | Havok | Hellion | Hepzibah | Husk | Iceman | Ink | Jean Grey | Joseph | Jubilee | Juggernaut | Karma | Lady Mastermind | Lifeguard | Lizard | Lockheed | Longshot | Maggott | Magma | Magneto | Marrow | Marvel Girl | Mercury | Mimic | Multiple Man | Mystique | Namor | Nate Grey | Nightcrawler | Northstar | Omega Sentinel | Petra | Pixie | Polaris | Prodigy | Psylocke | Revanche | Cecilia Reyes | Rockslide | Rogue | Sage | Shadowcat | Skids | Spider-Man | Stacy X | Storm | Sunfire | Sunspot | Surge | Sway | Thunderbird | Warlock | Wolf Cub | Wolfsbane | Wolverine | X-23

X-Men: Wolverine | Professor X | Jean Grey | Cyclops | Storm | Shadowcat | Nightcrawler | Iceman | Beast | Colossus | Magneto | Mystique | Archangel‡ | Havok† | Banshee† | Darwin† | Quicksilver | Bishop | Blink | Sunspot | Warpath | Negasonic Teenage Warhead | Rogue | Selene Gallio
Non X-Men Mutants: Jubilee | Kayla Silverfox | Gambit | Deadpool | Emma Silverfox | Yukio | Caliban† | X-23 | Wolfsbane | Magik | Cannonball | Mirage | Lockheed
X-Force: Deadpool | Cable | Domino | Peter | Bedlam | Shatterstar | Zeitgeist | Vanisher | Firefist
Humans: Moira MacTaggert | Kenuichio Harada | Mariko Yashida | Vanessa Carysle | Dopinder | Weasel | Blind Al | Peter

X-Men (1992): To be added
X-Men: Evolution: To be added
Wolverine and the X-Men: To be added
Marvel Anime: X-Men: To be added
Legion: To be added
The Gifted: To be added

See Also
X-Men Movie Heroes