The birth of the Multiverse begins here!In the classic tale "The Flash of Two Worlds" from The Flash #123, police scientist Barry Allen—also known as the Silver Age Flash—finally meets his Golden Age predecessor Jay Garrick—the original Scarlet Speedster—and the destiny of the DC Universe changes forever! This unprecedented meeting of the Fastest Men Alive marked the beginning of DC's famous multiple Earths, with Barry's world becoming "Earth-1" and the world of Jay and his fabled teammates from the Justice Society of America becoming "Earth-2". From these humble beginnings would grow the vast DC Multiverse that we know today—home to the greatest and most iconic superheroes in comics history! Now the first six corss-world meetings of the two Flashes are presented here for the first time in a special deluxe edition. Written by Gardner Fox and John Broome and illustrated by legendary penciller Carmine Infantino and inkers Joe Giella and Sid Greene, this volume also features insightful introductory texts by celebrated superhero scribes Geoff Johns and Paul Levitz!