"Ignition, Part 5 of 6: Secrets"
*Batman has come to talk to Wally West, the Flash, and when he pulls back his cowl to reveal that he is Bruce Wayne, Wally's memories come flooding back. He remembers that the Spectre, their old ally Hal Jordan, had promised to remove the world's memory that he had been the Flash, but had neglected to tell him that even the super-heroes, and even Wally and Linda would forget. Batman wants Wally to talk to the Justice League, let them remember who he is, but Wally has things to sort out in Keystone City first. And while talking with Linda, who is quitting medical school, he realizes who the cop killer is. At the exact moment he makes this realization, Ashley Zolomon walks in on Alexander Petrov donning the Mister Element gear. *Source: dcuguide.com