The Golden Age Flash's time-tossed teenage daughter, Judy Garrick-a.k.a. the Boom-has been restored to the present, but a deadly threat has returned along with her! The man who engineered the "accident" that gave Jay his powers has a plan more than 80 years in the making, and now the father-daughter speedsters must save a world that is wholly unprepared for the forgotten menace of...Doctor Elemental! It's a thrilling adventure spinning out of the events of Stargirl: The Lost Children and Justice Society of America from writer Jeremy Adams (The Flash, Green Lantern) and artist Diego Olortegui (Aquaman: The Becoming)!