X-Factor (2005) #217
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The daughter of former X-Men member Sean Cassidy, a.k.a. Banshee, and Maeve Rourke, Theresa Rourke was raised by her first cousin once removed, mutant terrorist Thomas Cassidy, a.k.a. Black Tom.
Bitten by a radioactive spider, high school student Peter Parker gained the speed, strength and powers of a spider. Adopting the name Spider-Man, Peter hoped to start a career using his new abilities. Taught that with great power comes great responsibility, Spidey has vowed to use his powers to help people.