Theresa Cassidy, or Siryn, made her debut back in Spider-Woman #37. Sheâ s gone from a former criminal at Black Tomâ s side to the rightful daughter of Sean Cassidy, aka Banshee.

The Birth of His and Siryn's Child Should Have Been a Celebration, Not a Tragedy In Peter David's X-Factor #39 from 2009, Jamie Madrox and his teammate Theresa Cassidy, the daughter of classic X ...

Siryn, whose real name is Theresa Cassidy, is the daughter of Sean Cassidy, better known as longtime X-Man Banshee. As you can see in the image below, Siryn has a green and yellow costume with a ...

Theresa Marie Cassidy Resident of Walnut Creek A Walnut Creek resident, passed away on Sunday, January 14, 2007 after a courageous battle with cancer. Tess was born in Philadelphia, PA, on August 2… ...