|Real Name||Sean Cassidy|
|Powers and Abilities|| Sonic Scream|
|Family and Friends|| Black Tom Cassidy (Brother)|
Moira MacTaggert (Lover)
Sean grew up with his brother Tom, but the two were rivals. Since both were mutants, they were each immune to each other's powers.
Sean eventually grew up and met Moira MacTaggert. He moved to Muir Island where the two researched genetic mutation. While there, he met Moira's former boyfriend Professor Charles Xavier and his X-Men.
Powers and Abilites
For reasons unknown, Sean and Tom were made siblings in the series rather than cousins as in the comics.
In the Comics
He has joined the X-Men, even leading the team and being an instructor.
He has a daughter with similar powers. Black Tom took her when she was a baby and raised her to hate Banshee. She eventually turned around and joined the X-Men with her father.