The true identity of the "Mystery Girl" was revealed in the Flash Season 4 finale.
Tonight (May 22) The CW will be airing the fourth season finale of The Flash. The final episode of The Flash Season 4 is called “We...
EW got some scoop from Grant Gustin about the Flash Season 4 finale cliffhangers.
Preview images for the Flash Season 4 finale "We Are The Flash"
Preview trailer for the Flash season finale "We Are The Flash"
Preview clip and "Inside" video previewing the Flash episode "Think Fast"
Preview clip and "Inside" video for the Flash episode "Harry and the Harrisons"
Preview images for the Flash episode "Think Fast" guest starring Arrow's David Ramsey
Official CW description for The Flash season finale "We Are The Flash"
Preview trailer for The Flash episode "Harry and the Harrisons"