TV’s go-to bad guy is adding yet another villanous role to his resume.

Robert Knepper, who is well-known for his run as Prison Break‘s slithery T-Bag and currently is busting heads on TNT’s Mob City, has been cast on The CW’s Arrow in the plum role of DC Comics master criminal William Tockman aka “Clock King.”

In his Arrow iteration, “Clock King” has earned his nickname being a brilliant criminal who plans his crimes with the utmost precision, down to the second.

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Knepper’s guest-starring gig is set for Episode 14 — the same episode that brings back Alex Kingston as Lance familiy matriarch Dinah.

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In addition to his aforementioned role as Theodore Bagwell (which he reprised on A&E’s Breakout Kings), Knepper’s TV credits include a recent episode of The Blacklist, The CW’s Cult, Heroes and Criminal Minds. He also was recently cast as Antonius in The Hunger Games: Mockingjay, Parts 1 and 2.

Arrow lets fly with its thoroughly thrilling fall finale tonight at 8/7c, then resumes Season 2 on Jan. 15.

In the latest Spoiler Alert!, we review Arrow‘s introduction of Barry Allen aka The Flash