The Flash #123

Barry Allen appears at the Community Center in Central City to perform for kids and during one of his amazing tricks is mysteriously transported to Keystone City...a place that he recalls that the original Flash once lived. The two meet and Barry surmises that Jay lives on a parallel Earth...one that evidently Earth-1 writer Gardner Fox tuned in on when he wrote the adventures of the Flash in the 1940's. Jay tells Barry that a crime wave has hit Keystone City and asks Barry for his help.