Debuting under the codename Siryn, she later retired the name and went by Banshee, in honor of her late father, Sean Cassidy, who first used the alias.

Like her father, the X-Men's Banshee, Theresa is an Irish mutant who possesses a "sonic scream" that can incapacitate and injure an opponent's hearing, or send powerful vibrations through the air, the latter of which she can use to fly. Her name refers to the Sirens of Greek mythology.

Theresa was raised by Banshee's cousin and nemesis Black Tom Cassidy without Banshee's knowledge. By her early teens, she left Black Tom and eventually joined the X-Men offshoots X-Force and later X-Factor.

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