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Siryn in X-Factor v3 #5.

Siryn is a female comic superhero who features in Marvel Comics.



Theresa Maeve Rourke Cassidy was a red-haired female Mutant daughter of Sean Cassidy and his wife Maeve Rourke. During their time together, she became pregnant but did not inform Sean at the time. Unknown to anyone, Sean Cassidy was secretly an Interpol agent and a Mutant who was regularly deployed on assignment for months at a time. (X-Force v1 #31)

After her death, her daughter Theresa was left in the care of Tom Cassidy as the child's father was not present. Eventually, Sean returned to Ireland only to be shocked to find that Maeve had died and stood by her grave. Tom attempted to console his cousin and tell him that he had a daughter but an angry Sean unleashed his sonic cry on him. He lashed out on Tom as he blamed him for not looking after Maeve in the time he was away. Thus, Sean never came to realise that he had a daughter and Tom Cassidy developed an enmity with his cousin. He decided to raise the girl himself where he told her that her father had died making her believe she was an orphan. Though an act of revenge against Tom, he did genuinely care for Theresa as if she was his own daughter. As she grew older, her uncle began to engage in more illegal activities and decided to ship her to St. Elizabeth's boarding school by the time she was twelve years old. A year later, she remained angry with Tom with this resulting her trying out drinking alcohol for the first time. Her friends stopped the drinking as they hated the taste but Theresa continued as she used it to numb the painful emotions she was experiencing at the time. When she was 15 years old, she was informed by the school that Interpol had arrested her uncle Tom Cassidy for black marketing. Afterwards, she began to shut herself out from the world with her not going to his trial where he was sentenced to five years in prison and never visited him. (X-Force v1 #31)

She was eventually informed by her uncle Tom Cassidy that Sean Cassidy was her father and still alive. This saw her journey to the X-Men where her father resided and delivered him the letter from her uncle which said that Theresa was his daughter. A shocked and overjoyed Sean Cassidy then reunited with the daughter he never knew he had with Theresa being the last link he had to his dead wife Maeve Rourke Cassidy. (Uncanny X-Men v1 #148)


Personality and attributes

Originally, she operated under the name of Theresa Rourke with her using the same last name as her mother. (Uncanny X-Men v1 #148)

She was said to be the kind of girl that people fell heads over heel in love. (X-Force v1 #31)

To Theresa, Tom Cassidy was her uncle and a parental figure to her as he was responsible for raising her. When she was 12 years old, he sent her away to boarding school and she knew that he sent her away as much for her safety as his own. Despite that, she felt hurt by his actions and was angry at him for sending her far away from home. Though angry, a part of her was also afraid as she thought she had done something and was being punished for it. (X-Force v1 #31)

Powers and abilities


  • Siryn was created by Chris Claremont and Steve Leialoha where she made her first appearance in Spider-Woman v1 #37 (April, 1981).

Alternate Versions

In other media



  • Spider-Woman v1:
  • X-Force v1:
  • Deadpool: Sins of the Past v1:
  • X-Factor v3:

External Links

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