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A familiar person returns to the unit, but his motives are scrutinized. Elsewhere, a captured skitter is imprisoned at the camp, and Hal connects with Maggie as she casts light on her past.
Ben and Hal go on patrol and help a boy, only to have their bikes stolen. The subsequent search for the bikes leads to a major discovery. Meanwhile, Matt steps into a dangerous situation; and Weaver reconnects with a family member.
Hal happens upon bodies of de-harnessed kids and encounters a person from his past. Elsewhere, Tom and Anne inch closer together; and health issues plague Weaver.
The season's plot focuses on the 2nd Massachusetts' discovery that a large community of survivors has formed in Charleston, their journey there, and their reception once they arrive. It focuses on the discovery that the Skitters are themselves "harnessed" and mind-controlled by the invaders, but that some of them are resistant to the effects and are rebelling against their Overlords.