 Their powers came from stepping in a spill of the chemicals from the Big Bang.Mirage agreed to help Boom steal money to buy a new place for them to live (only because he is her older brother, a brother-sister relationship where he usually bosses her around), but after talking with Static, she sees how having powers has corrupted her elder brother and helps Static stop him.Mirage was then taken in by the Dakota City Department of Social Services, but not before she generated an illusion of Static flying into the distance, as a favor to Static (Static/Virgil needed to convince his sister that he was not Static).