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An FBI agent recruits his brother, a mathematics genius, to help solve crimes. (Learn more)

Starring: David Krumholtz, Rob Morrow, Peter MacNicol (View All)

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Disturbed

Episode 21 | Season 5  (2008-2009)
(Airdate May 1, 2009)

Still feeling responsible for Don's near-fatal stabbing, Charlie puts his focus into tracking down an unnoticed serial killer while the agents revisit math theories from when Charlie first started working with the team to help solve the case.

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