Universe
Marvel Universe

Real Name
Theresa Rourke Cassidy

Aliases
None

Identity
Secret

Occupation
Private detective; former adventurer, research assistant, criminal, student

Citizenship
Ireland

Place of Birth
Cassidy Keep, County Mayo, Ireland

Known Relatives
Sean Cassidy (Banshee, father, deceased), Maeve Rourke Cassidy (mother, deceased), Thomas Cassidy (Black Tom, first cousin once removed), Victoria Donnelly (mother's cousin)

Group Affiliation
X-Factor Investigations; formerly X-Corporation, X-Force, Fallen Angels, Muir Island X-Men; former ally of Black Tom and Juggernaut

Education
Boarding school

Height
5'6"

Weight
115 lbs.

Eyes
Blue

Hair
Reddish blonde

Powers
Siryn possesses sonic powers similar to those of her father Banshee, although she is able to use her powers in ways that he apparently cannot. She possesses an enhanced sense of hearing and sonar. While screaming Siryn is able to fly, most likely around Mach 1. Siryn has especially potent sonic attacks. She can shatter objects, project sonic force, or cause pain and unconsciousness. Siryn is able to subtly influence and control others with her sonics as well as cause them to enter a trancelike state. Siryn has recently shown the ability to also block out others from hearing sounds so that she can secretly deliver messages.

First Appearance
Spider-Woman #37 (1981)

Origin
X-Force #31 (1994)

Significant Issues
Joins Black Tom and Juggernaut in heist, defeated by X-Men (Spider-Woman #37-38, 1981); meets Banshee for first time (Uncanny X-Men #148, 1981); battles Black Tom and Juggernaut, joins X-Force (X-Force #3-5, 1991); confronts Black Tom, quits drinking (X-Force #31, 1994); first befriends Deadpool (Deadpool #1-4, 1994); becomes Deputy Leader of X-Force (X-Force #47, 1995); accompanies Warpath to meet Michael Whitecloud (X-Force #72-74); injured by Feral, quits X-Force (X-Force #90-91); regains powers (Wolverine #154-155, 2000); searches for Cable along with Cannonball and Deadpool (Cable & Deadpool #15-18, 2005); learns of Banshee's death (X-Factor #7, 2006). For more detaled list see Official Handbook Bibliography