 In "Run" when Clark goes through Barts fake IDs he lists off the  names Jay Garrick, Barry Allen, and Wally West. All three are the  secret identities of the comic book Flashes. Jay Garrick is the  original Flash who is now a member of the Justice Society of  America. Barry Allen was the Silver Age Flash and his nephew Wally  West is the current Flash who took over after Allens death.