Tom's life hangs in the balance as his beamer drifts into space; Tom encounters a surprising guest; Anne reluctantly steps into Tom's shoes to help lead the 2nd Mass.
A surprise skitter attack leaves the 2nd Mass without food. In desperation, Maggie, Ben, Pope, and Sara go on a dangerous mission hoping to find supplies. Along the way, they encounter a family deeply scarred by the Espheni plan. Maggie must make false promises to insure the 2nd Masses' survival. Meanwhile, Tom and Anne discover the Espheni have created something part Espheni, part Skitter, part Hornet.. and part human.
The 2nd Mass discovers the source for the seemingly endless supply of enemy forces. With the Volm's help, Tom's leadership begins to spread to remaining human militias around the world. Hal disobeys his father to help Maggie on a personal mission. Meanwhile, Tom has to make an agonizing choice that ultimately risks one of their own, leaving lasting repercussions for them all.
A mission to procure vehicles and fuel goes awry. Cochise shares troubling news with Anne that will test both her medical and leadership skills. Anthony's mental stability and his loyalties are brought into question. Meanwhile, a desperate Pope takes things into his own hands.
Tom takes refuge with a family that has distanced itself from the fight; Hal and Isabella's romance grows as they search for Tom; the 2nd Mass locates an Espheni device; Maggie makes a decision.
Tom gains a powerful new weapon against the Espheni; Ben attempts to extract enemy plans; Pope discovers that Tom is alive; the 2nd Mass must reassess their situation when an unexpected visitor appears.
The final standoff brings the Masons, the 2nd Mass, and their new allies into the bowels of an iconic American location, wrought with unpredictable obstacles.
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