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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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When Worlds Collide

Episode 18 | Season 4  (2007-2008)
(Airdate May 16, 2008)

Don and Charlie find themselves in conflict over their differing beliefs as they investigate a case involving national security. Meanwhile, Megan faces a crisis of conscience and leaves the team.

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