Another Bad Guy.

Seamus Dever (ex-Ian Devlin, GH) may be starring on the ABC hit “Castle,” but he still has time to pop up on other Primetime shows as well. As he recently Tweeted, “I go back to my roots as guest star bad guy,” in the two part season finale of TNT’s series “Dark Blue.”

“Dark Blue” is about a team of undercover police officers in Los Angeles and stars Dylan McDermott (“The Practice”). The back-to-back episodes will kick off at 9.00 PM EST on September 15.

For more actor appearances check out the General Hospital News Room. Join Soaps.com on Twitter @soapoperafan, and Facebook to stay up to date on all the latest scoop.