Michael must work with an enemy over chemical weapons; The team must also track down Justin Walsh, the man in possession of the list.
An AWOL Marine is joined by his younger siblings in a vengeful quest to kill the man who murdered their older sister.
C.D. investigates the death of a friend's son which has been ruled accidental; Walker and Trivette search for an escaped convict.
The Essence is the Edenians' only hope to escape Outworld treachery.