We reported earlier this month that Tony Woodward, a.k.a. Girder will be a recurring villain who debuts in the sixth episode of Season 1. Greg Finley has signed on to play Girder in Episode 6 and Episode 7, although it isn't clear if he will return later on in the season as well.
The S.T.A.R. Labs explosion in the series premiere, which gave Barry Allen (Grant Gustin) his super speed, also affected Tony Woodward, who now has the ability to turn his skin into living metal. He goes on a crime spree with these new powers, and it's up to The Flash to stop him.
Aside from his role as the Atrian teenager Drake on CW's Star-Crossed, Greg Finley also starred as Jack Pappas on ABC Family's The Secret Life of the American Teenager, along with recent guest-starring roles on Emily Owens M.D., Necessary Roughness and Law & Order: Special Victims Unit.