Story:

 

The former Overwatch agent known as Tracer is a time-jumping adventurer and an irrepressible force for good. Lena Oxton ( call sign "Tracer" ) was the youngest person ever inducted in Overwatch's experimental flight program, her skills made her an ideal candidate.Known for her fearless piloting skills, she was handpicked to test the prototype of a fighter jet capable of teleportation, the Slipstream. However, during it's first flight, the aircraft's teleportation matrix malfunctioned, and it disappeared. Lena was presumed dead. She reappeared months later, but her ordeal had greatly changed her, her molecules had been desynchronized from the flow of time.

 

Suffering from "chronal disassociation," she was a living ghost, disappearing for hours and days at a time. Even for the brief moments she was present, she was unable to maintain a physical form. Overwatch's doctors and scientists were stumped and Tracer's case seemed hopeless until a scientist named Winston designed the chronal accelerator, a device capable of keeping Tracer anchored in the present. In addition, not only did the device cure the problems presented by her condition, but it gave Tracer the ability to manually speed up, slow down or rewind her own time at will. With her newfound skills, she became one of Overwatch's most effective agents until the organization was shut down. Since Overwatch's dissolution, Tracer has continued to right wrong's and fight the good fight wherever the opportunity presents itself.