Alexander "Xander" Harper Berkeley (born December 16, 1955) is an American actor. He is known for his television roles of George Mason on the political thriller series 24 , Percy Rose on the action thriller series Nikita and Sheriff Thomas McAllister on the crime drama The Mentalist .
Moments of Clarity - A repressed agoraphobic's daughter meets a hardened pastor's daughter, and while escaping their homes to attend the annual church youth group jamboree they discover their worlds aren't what they once thought they were.
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Berkeley, whose more recent TV credits include Nikita , Being Human , Salem and Zo o, is joining AMC’s zombie smash in a top-secret Season 6 recurring role that sources confirm is not infamous comic baddie Negan . That said, I hear his character — whose name is being kept under wraps — does share some of the same characteristics as Negan. Namely his narcissism, huge ego and self-preservation. He’s also said to relish the superiority that comes with being in control, but he plays it off with a car salesman-type charm.