WB is casting a female of open ethnicity in the 25-35 age range to play the lead villain of the movie. The character is described as a “psychopath” following in the footsteps of an older male relative. Popular theories are Captain Cold’s sister Golden Glider or Mirror Master’s daughter Prismatik. Earlier versions of the project featured a gender-swapped Mirror Master as one of the villains, so they could have just reworked the character.

The older male relative will reportedly be an enemy of Michael Keaton’s Batman, and the female villain will develop a rivalry with the Flash after he becomes stranded on Batman’s universe and joins forces with Batman to return home in order to save the Multiverse.