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Seven months following the events of season two, the 2nd Mass has made Charleston into their home. Tom has been elected president of the new United States, and humanity has begun to make headway against its otherworldly enemy. The main reason for this is the arrival of a friendly alien race called the Volm, which have a standing grudge against the evil Espheni. Meanwhile, the hunt is on for a spy in the colony, and Hal is plagued by strange dreams.