Written by Gardner Fox and John Broome; Art by Carmine Infantino, Joe Giella and Sid Greene; Cover by Carmine Infantino and Murphy Anderson

The super-speedsters of two worlds race into adventure in this new collection of tales! Learn how police scientist Barry Allen, The Flash of the 1960s, first crossed paths with his predecessor, Jay Garrick, in this hardcover featuring THE FLASH #123, 129, 137, 151 and 173.