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A little bundle of joy arrives in Charleston, as Tom and Ann celebrate the birth of their daughter Alexis. All is not happy however, as battles between humanity and the Espheni continue to escalate. In a desperate bid to cut off an enemy power source, Tom enlists the help of an reclusive nuclear scientist named Dr. Roger Kadar. Elsewhere, the spy takes out of a member of the colony, and Hal's dreams of Karen intensify.