Weaver turns more and more erratic, stirring up trouble while on a reconnaissance mission with Tom and Hal. Meanwhile, Pope constructs a potent weapon; and Anne makes a startling discovery while performing an autopsy on a skitter cadaver.

Conclusion. Suspicions arise that danger may indeed lurk at the children’s safe haven. Before long, Mike happens upon a harrowing truth and an unanticipated enemy emerges.

Part 1 of 2. Another resistance leader appears at the camp, sounding an alert that the aliens will soon attack and offering to take the children to safe shelter. With time running out, Tom and the others must weigh his proposal.

Hal orchestrates a shadowy and perilous plan to slip into an alien lair to rescue Ben and other ensnared kids.

Tom and his crew undertake a mission to retrieve motorcycles and cautiously allow Pope to join them. While on the task, they’re attacked by a harrowing entity that may be even more formidable than aliens. Elsewhere, Anne and Harris hit upon a crucial discovery.

A doctor (Steven Weber) who shares a history with Tom arrives at camp, and he may hold the key to saving the kids who’ve been abducted by aliens. Meanwhile, the ragtag crew has nightmarish encounters with skitters and mechs.