Sean Cassidy

Maeve Rourke (Stepmother, deceased)

Theresa Cassidy (Paternal Half Sister)

Unborn child (Deceased)

Tom Cassidy (Cousin)

## Background

### **1970 - 1997: Sean Cassidy**

Sean Cassidy was born as the heir to the castle & estate of Cassidy Keep, Ireland, as well as a small fortune. After his mother's death when he was five, his father eventually remarried Maeve Rourke a decade later. According to Liam Cassidy, Maeve came into his life like a lightning bolt. She challenged him, cared for him & made him a man. After dating for just a year, Liam proposed & they were wed the next year. Maeve soon became pregnant, giving birth to Sean's half sister Theresa Cassidy.

For college, Sean went away to Dublin, Ireland & attended Trinity College, where he got his Bachelor's of Science. After college, Sean became a detective at Interpol, the international law enforcement organization. Although Cassidy had long discovered his mutant powers in his adolescence, he kept them secret, even from the rest of Interpol.

However, Cassidy's powers were known to his disreputable cousin, Tom Cassidy, who had discovered that he himself was a superhumanly powerful mutant. Sean & Tom had long been rivals, especially over the love of Victoria before she ultimately married Sean.

Sean was later assigned a top secret mission which required that he stay out of touch with his family for a considerable amount of time. When he left on the mission, Victoria was in her first month of pregnancy, although neither Sean nor Victoria knew it at the time. Not able to keep herself calm in Sean's absence, she lost the baby.

On returning from his mission, Sean was informed by his wife that she had miscarried his child & was leaving him. At first, Cassidy attempted to escape his despair over this news by throwing himself into his work at Interpol. Eventually, the still melancholy Cassidy left Interpol to become a freelance operative & as time went on, found himself engaged in some criminal activities.

The legal authorities never discovered that Cassidy was guilty of crimes, but the mutant known as Professor X did, thanks to his telepathic ability. The Professor used his powers to persuade him to come to New York & meet with the X-Men. But Sean was quite hostile, prompting Xavier to use a psionic "mental hold" on Banshee until he calmed down. Once free of the mental hold, Banshee decided to return to an honest life & join the X-Men.

## Romantic Relationships

* Victoria Donnely: Girlfriend (1991 - 1994); Wife (1994 - 1996)

## Powers & Abilities

* **Mutant Physiology:** Banshee is a mutant who possesses unusually strong sonic abilities. He created powerful sonic waves with his voice with which he could achieve various effects, often with the assistance of psionic abilities which function only in unison with his sonic abilities.
	+ ***Sonic Scream*:** He had the ability to shatter solid objects with an incredibly loud & destructive sonic scream.
	+ ***Flight*:** He had the ability to fly at subsonic speeds by using his voice to propel him through the air and ride via sound waves.
	+ ***Sonar*:** He could use his sonic powers as a form of sonar. By sending out a precise, pure note & listening to the returning, altered wave-front of the note, he could evaluate his surroundings in total darkness with varying degrees of resolution.
	+ ***Sonic Shield*:** He could tighten sound waves around himself or others near him, making a barrier against outside attack.
	+ ***Vocal Disorientation*:** He had the ability to change someone’s balance, by affecting their equilibrium using his sonic scream.
	+ ***Vocal Trance*:** He had the ability to subtly influence people's subconscious mind by changing the tones & vibrations of his voice using hypersonic suggestions & persuasive abilities.
	+ ***Vocal Unconsciousness*:** He had the ability to affect the fluid in someone’s ear causing the person to go unconscious.
	+ ***Sound Immunity*:** Banshee's hearing & equilibrium were unaffected by his hypersonic abilities or other similar sound/sonic-based abilities.
	+ ***Superhuman Vocal Stamina*:** He possessed superhuman stamina in his lungs, throat, and vocal cords.
* **Interrogation:** Sean is a gifted detective, quickly rising up in the Interpol before he quit.
* **Espionage:** He is a seasoned undercover operative & formidable combatant. Sean is also well-versed in combat strategy & tactics. He is an excellent marksman, amateur machine-smith, educator, organizer, & lobbyist.
* **Banshee's Wings:** Professor X developed a harness for Banshee's X-Uniform. Using the Harness & his sonic scream he is able to glide on air currents. Using the harness he is able to fly at subsonic speeds.

### Weaknesses

* **Vocal Cards:** His vocal cords were susceptible to injury from excessive strain in using sonic powers. He has survived normally fatal throat wounds at the cost of his sonic powers temporarily.

### Ratings

* **Intelligence:** Unknown
* **Strength:** Unknown
* **Speed:** Unknown
* **Occult:** Unknown
* **Weapons:** Unknown
* **Energy Projection:** Unknown
* **Strategy:** Unknown
* **Fighting Ability:** Unknown

## Trivia

* He originally wanted to join Interpol when he was younger.
* His interests included American country music and playing the piano.
* Banshee is immune to his cousin Tom's energy blasts.
* Despite being half-siblings, Sean & Theresa are constantly told how much they look alike.

## Notes

* The original character of Banshee belongs to the Marvel Universe.