Season 4, Episode 18 When Worlds Collide

First Aired: May 16, 2008

In the fourth-season finale, one of Charlie's colleagues is arrested on suspicion of being linked to a terrorist group that may be planning an attack on local schools. While Charlie works to free his friend, his actions cause him and Don to confront their opposing beliefs in how the FBI conducts its business. Meanwhile, Megan resigns her position to concentrate on pursuing her education and to counsel women who are in prison.

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  • Premiered: January 23, 2005
  • Rating: TV-14
  • Premise: An FBI special agent in Los Angeles teams with his mathematical genius brother to solve crimes. Don, a veteran investigator, relies on hard facts and evidence to catch crooks, while his younger brother Charlie, a brilliant university professor, analyzes ma… (more)

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