Malcolm McDowell Malcolm McDowell

We see a serious bad guy in Patrick Jane's future: Malcolm McDowell will guest-star on an upcoming episode of The Mentalist, has learned exclusively.

Check out photos of the cast of The Mentalist

McDowell, best known for playing nihilist Alex in A Clockwork Orange,

will play the leader of a twisted religious cult in which Jane (Simon Baker) gets entangled. Series creator Bruno Heller describes the character as a "great heavy.""He seems to have his sinister tentacles in every pie, which is really mixing horrible metaphors, but he's that kind of guy," Heller tells with a laugh. "We're very lucky to get someone as great as Malcolm McDowell to play that."McDowell, who recently starred in Rob Zombie's two Halloween reboots, recurred on Heroes as the mysterious Linderman during the first three seasons and on Entourage as Ari Gold's former mentor/nemesis Terrence. Fun fact: He played the Ricardo Montalban role in the short-lived 1998 Fantasy Island reboot.

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Also look for McDowell on the March 1 episode of CSI: Miami, which was directed by Zombie. McDowell's episode of The Mentalist is slated to air April 29. New episodes return on March 4 at 10/9c.Are you excited to see Baker and McDowell go head-to-head?