Melissa Kramer

Tom and his team head out to track down more motorcycles for the 2nd Mass., relying on Pope to guide them to a good location. They hit the jackpot until they meet some skitters and harnessed teenagers at the bike shop. Back at the base, Dr. Harris (guest star Steven Weber) and Anne disagree over the best method to gather more intelligence on the aliens.

Hal comes up with a risky new plan to rescue captured teenagers from the aliens, but it might require putting someone at risk. Meanwhile, a sudden tragedy causes Anne to make an enormous discovery that proves instrumental to Hal's risky plan.

Lt. Terry Clayton (guest star Henry Czerny - The Tudors) of the 7th Mass arrives with word that the aliens are on their way to attack the 2nd Mass. Clayton's plan to lead the children to a safe haven while the adults remain behind to fight is met with some resistance from the parents, including Tom.

Hal takes the lead fighting an unexpected threat against the children of the 2nd Mass. Anne has her hands full when Sarah goes into labor while the 2nd Mass. base is being evacuated. Henry Czerny (The Tudors) guest-stars.

With Weaver leading several squads of fighters against the aliens, Tom remains behind to help protect the civilians as they evacuate. But a major breach in security endangers both the soldiers and the civilians. Tom is confronted with a decision that may lead him to discovering what the aliens want with the captured teenagers, humankind and the planet.