Eddie McClintock is leaving the Warehouse for an hour or so.

The Syfy star announced on Twitter yesterday that he’ll guest star on the Castle Season 6 finale, coming on board the May 12 episode as Rogan O’Leary, a small town hustler who is known for his lying, cheating and deceiving all around.

Even more intriguing? Network sources say the character has a "complicated past” with a certain female detective.

Along with his role on Warehouse 13 (which premiers its final season on April 14), McClintock has appeared on Bones, My Boys, Modern Family, Malibu Country and The Mentalist.

Castle, meanwhile, returns with a new episode on April 21.

You can watch Castle online any time at TV Fanatic if you need to catch up before then.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.