King has previously appeared in Tween Fest, Bent, New Girl, and Ghost Whisperer.
In season three, she’ll play Frankie Kane, “a meta-human with the ability to control metal… but her powers come with a dangerous side-effect, causing her villainous alter ego known as Magenta to emerge.” She joins fellow season three guest stars Grey Damon and Susan Walters.
The new season of The Flash premieres on October 3rd.
What do you think? Do you watch The Flash? Are you looking forward to season three?