(W) Gardner Fox, John Broome (A) Carmine Infantino, Others (CA) Murphy Anderson, Carmine Infantino Learn how police scientist Barry Allen, the Flash of the 1960s, first crossed paths with Jay Garrick, the Flash of the 1940s, in this hardcover collecting The Flash #123, #129, #137, #151, #170 and #173. These are the stories that first established the science fiction concept of parallel universes in DC Comics, as the Fastest Man Alive learned to use his super-speed to travel across dimensions to Earth-2!