Warren Christie and Glenn Morshower are new additions to Castle Season 6.

According to Entertainment Weekly, the former Alphas star will appear on the second episode of the ABC hit this fall as a reporter who gets involved in a major national security issue.

Morshower (24, Friday Night Lights), meanwhile, will also stop by that same installment, portraying an ex-Army general hoping to keep some secrets from his past buried. TV Guide was the first to break this piece of casting news.

Castle Season 6 premieres on Monday, September 23 and other big names already set to appear include Lisa Edelstein and Yancey Arias.

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