Sabotage is the sixth episode of the first season. It was released on February 25, 2005.
Synopsis
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An unidentified terrorist is re-enacting horrendous train accidents with mass fatalities and leaving a number code at the scene, which Charlie must race to crack before more people die.
Title
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Beyond the literal, there is the matter of self-doubt which is so destructive to Charlie's process, and perhaps office politics.