Megan Danso

After the people of Charleston defeat another alien attack with the help of new advanced weaponry, Tom is invited to meet with a powerful leader (guest star Stephen Collins). While Hal wrestles with an invasive evil, Ben struggles with his identity and the notion of being human again. And Anne uncovers startling new information that puts everyone in jeopardy. Robert Sean Leonard guest stars.

With hostilities escalating between the resistance and the alien invaders, Tom calls on a nuclear specialist (guest star Robert Sean Leonard) known as "The Rat King" to come up with a plan that will strip the aliens of their power. As suspicion continues to mount about a mole within the resistance, Tom and his leaders make a drastic decision that jeopardizes trust among the group. Anne, meanwhile, has a feeling that all is not right with her newborn. Gloria Reuben also guest stars.

The two-year anniversary of the alien invasion is fast approaching as the people of Charleston prepare for another potentially devastating offensive. A sniper attack by an unlikely gunman creates questions and doubts within the new government. Hal believes he knows the identity of the mole, and Anne's concern for her baby continues to grow. Gloria Reuben guest stars.

Things seem much too calm for Tom, making him suspicious of his surroundings. On his way back to Charleston, he makes a number of discoveries, some incredibly surprising and others utterly horrifying. Meanwhile, Weaver and Pope butt heads over how to handle the suspected mole. Gloria Reuben guest stars.

The Espheni reveal their new plan to Tom, and he is faced with an impossible decision. Meanwhile, Weaver and Pope investigate a way out of the Espheni prison, while Matt struggles to hide his true allegiance from the "Team Leaders" at the Espheni Youth Camp. Elsewhere, Anne leads an exhausting search for her daughter Lexi, while Ben's concerns about Lexi's increasing powers uncovers a devastating secret she's been keeping. Treva Etienne and Robert Sean Leonard guest-star.