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.
The Season 4 finale of The Flash is called "We Are The Flash."