Diana talks peace while readying the fearsome Triax super-weapon that could reduce Los Angeles to rubble. Meanwhile, Resistance fighters activate a new weapon of their own - a captured Visitor mothership.

Seeking to free his son Sean from the Visitors, Donovan grapples with an insidious, powerful alien named Klaus.

Led by Donovan, Ham, and Elias, the Resistance runs into a doublecross when they seek to rid a mining community from alien-backed thugs.

A small group of resistance sympathizers (Robin included) are arrested by Bates' police, and a prisoner will be handed over to the Visitors to be executed every day until Donovan, Ham, and Julie surrender.

Sent to investigate Charles' death, newly arrived Inspector General Philip allows Lydia to choose a trial by combat in a laser duel to the death with Diana.

Anxious to settle a personal vendetta, Philip trails a Fifth Columnist, hoping he will lead him to the Resistance and Donovan.

Julie and Donovan sneak aboard the Mother Ship to look for a hidden list naming all the Resistance leaders; Diana schemes to have Lydia's brother slain during a ritual celebration.