Cecilia Reyes decided to become a doctor when her father was gunned down in front of her as a child, and she was unable to do anything to help him. The X-Men tried recruiting her when it was discovered that she was a mutant, but Reyes had no interest in being a superhero. When she was targeted by Operation: Zero Tolerance, a government-backed anti-mutant task force, she was forced to join forces with the X-Man Iceman and other mutants to escape New York City and track down Bastion, leader of Operation Zero Tolerance.