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

The Resistance, led by Donovan, Julie, and Ham, stage a daring sabotage at a convention of Visitor commanders in a seaside estate where Diana intends to show off the ultimate device in processing humans for food.

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

When Diana seals off the Open City with an impenetrable force field which destroys humans on contact, Donovan and Ham must kidnap the alien genius responsible for its development.

With a blood sample from the "star-child," Diana creates an uncontrollable and deadly clone which seeks out Elizabeth; Bates tests Julie's loyalty when he suspects she is sympathetic to the Resistance whose headquarters he is preparing to destroy.

Ham and Kyle are captured by Visitors, and Charles, the Leader's special envoy, assumes command of the alien forces.

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.

While Bates remains in a coma Charles plots to overthrow him, elsewhere Willie is gravely wounded so the rebels kidnap a medical student of the Visitors.

Feeling Diana's presence threatens his power, Charles forces her to marry him, after which Alien law requires she return home.