X-Men Movies Wiki
X-Men Movies Wiki

Siryn (born Theresa Maeve Rourke Cassidy) is a mutant with the ability to produce a very loud, high pitched scream.


X2: X-Men United

Siryn is seen as one of Storm's students at the Museum.

Siryn using her sonic scream against the Weapon X invaders.

When Colonel William Stryker attacks the X-Mansion, she screams in horror at a sonic level before being tranquilized. She is eventually saved by Colossus.

X-Men: The Last Stand

She, along with other students, attended Professor X's funeral.

Siryn mourning for Professor X's death.

When the X-Mansion re-opens, she is seen giving Storm a hug before returning inside.

Powers and Abilities


  • Sonic Scream - Siryn has the ability to scream at sonic levels. It was able to disorient the entire school and the Weapon X invaders.





  • In the comics, Siryn is Banshee's daughter. However, Banshee in the Fox X-Universe is supposed to have died before 1973, making it impossible for the film version to be his daughter, although it could be possible she may be related through extended family.

External links