Ivan Sergei is about to invade CBI headquarters.

The actor (Crossing Jordan, Charmed) has landed a recurring role on The Mentalist Season 5, Entertainment Weekly confirms. He'll first show up on the September 30 premiere as an FBI agent named Gabe Mancini.

The report states that Mancini is actually just one of three federal agents who will likely make life miserable for Patrick Jane this fall. Polly Walker, meanwhile, has been cast in a similar role.

No word yet why these officers will be making an appearance.

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