Actor Jason Ritter (Parenthood, Gravity Falls and occasional Drunk History reenactor) has signed up for a guest spot on CBS' Person of Interest

5 Reasons You Should Be Watching Person of Interest

Jason Ritter.

Ritter will appear on the excellent sentient surveillance series as Simon Lee, a whip-smart, political Wunderkind who EPs Jonathan Nolan and Greg Plageman say has "an incredible gift of foresight." But is he victim or perpetrator? And is his foresight due in part to - oh - some sort of super computer?Ritter's Simon Lee will appear in the fifth episode of Person of Interest's upcoming Season 4.Ritter is also set to also appear on HBO's Girls, in the sixth episode of the next season.

Matt Fowler is a writer for IGN. Follow him on Twitter at @TheMattFowler and Facebook at Facebook.com/Showrenity