|Real Name||Theresa Rourke Cassidy|
|Relatives||Sean Cassidy (possible relative)|
|Base Of Operations||X-Mansion|
|Creators||David Hayter, Bryan Singer, Zak Penn, Michael Dougherty, Dan Harris|
|First Appearance||Last Appearance|
(April 30, 2003)
|X-Men: The Last Stand|
(May 24, 2006)
She can scream very loudly, and at a high-pitch.
Normal human female of her age.
- While Siryn is traditionally Banshee's daughter, X-Men: Days of Future Past establishes, that Banshee passed away prior to 1973. This makes it unlikely that he's her father, as she was a teenager, in the early 21th century.
- 2 Appearances of Theresa Cassidy (Earth-10005)
- Media Theresa Cassidy (Earth-10005) was Mentioned in
- 1 Images featuring Theresa Cassidy (Earth-10005)
- Quotations by or about Theresa Cassidy (Earth-10005)
- Character Gallery: Theresa Cassidy (Earth-10005)
- Fan-Art Gallery: Theresa Cassidy (Earth-10005)
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