"The Flash" Season 1, Episode 16, "Rogue Time," features Barry Allen traveling back in time to fix the timeline, resulting in a showdown with the Weather Wizard and the return of the Rogues. This episode introduces Lisa Snart and leads to a pivotal confrontation where Cisco is forced to reveal the Flash's identity to Captain Cold. For a full summary, see Arrowverse Wiki . 'The Flash' Season 1 Recap, Episode 16, 'Rogue Time'