: Chandler tracks the Immune leaders to Northern Florida. The team eventually locates a compound where the Immunes are gathered.

: Dr. Rachel Scott discovers a secret formula her mentor was working on, which provides critical information for her ongoing research into a permanent cure.

: The episode features tactical naval operations, including the use of ASROC torpedoes (anti-submarine rockets) as the crew of the Nathan James attempts to destroy a rival submarine, the Achilles . Title Confusion with Other Series