At least four different characters—each of whom somehow gained the power of the "Speed Force"—have assumed the role of the Flash in DC's history: College athlete Jay Garrick was the first character to take on the alter-ego "The Flash", other characters who have been the Flash are forensic scientist Barry Allen, Barry's brother-in-law Wally West who is currently the youngest Flash, he calls himself "Kid Flash"; and Barry's grandson Bart Allen who becomes "Impulse", the second hero known as Kid Flash. Each version of the Flash has been a key member of at least one of DC's premier teams: the Justice Society of America, the Justice League, and the Teen Titans. Most of the Flash stories take place in the fictional city of Central City.