Tom's life hangs in the balance as his beamer drifts into space. Tom encounters a surprising guest.

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.

The 2nd Mass discovers the source for the seemingly endless supply of enemy forces. Hal disobeys his father.

Tom gains a powerful new weapon. Ben puts his life on the line to extract enemy plans. Pope discovers that Tom is alive. Meanwhile, 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 new and unpredictable obstacles. Despite great loss along the way, they must persevere with hopes of once and for all reclaiming Earth and humanity.