Numb3rs: When Worlds Collide - Sept. 19 Preview

Numb3rs: When Worlds Collide - REPEAT - In the fourth-season finale, Megan leaves the team in the face of a crisis, and Don and Charlie investigate a national-security case that causes them to confront their opposing beliefs when one of Charlie's colleagues is arrested on suspicion of being linked to a terrorist group. Friday 10:00 et/9:00 ct on CBS.

The Flick Guru