Theresa Cassidy

Theresa Cassidy is Siryn, the Irish mutant daughter of Banshee, gifted with powerful sonic screaming abilities mirroring her father's. A longtime X-Force member, she operates alongside the broader X-Men family — appearing here in Panini Deutschland's German-language Marvel publications.

Theresa Cassidy made her comics entrance in 1997, stepping onto the page in a Panini Deutschland publication and keeping remarkably distinguished company — sharing adventures with the likes of Logan, Storm, and Roberto Da Costa across titles including Wolverine, X-Men, and Cable & Deadpool. Her catalog footprint spans a solid seventeen years through 2014, a quiet testament to staying power in the Modern Age. With only nine recorded appearances she's a genuine collector's discovery — the kind of character whose rarity makes each issue feel like a find worth hunting down.