Henry Ian Cusack is guest starring on The Mentalist and he will play the role of Lisbon's new arch nemesis. Find out more about his character in a scoop we grabbed from TV Guide --
"He is a charming, powerful man who no one can believe is in any way villainous. He's so charming in fact, that Jane & Co. will question Lisbon's suspicions, and they may have good reason. Lisbon's search for vengeance is triggered by a huge and traumatic failing on her part. In her eagerness and aggression to catch this guy, she puts other people in harm's way."
'The Mentalist' airs every Sunday on CBS.