In 2068, the war between the Union and the Polity begins with a shocking strike on a major stronghold. As Yaz joins the resistance movement, Chase confronts a shocking truth.

While General Marin orders a much-needed reprieve, Chase considers the complex implications of his discovery, and Miranda angles for a promotion. Then, a figure from the Polity’s past emerges from the shadows.

As the battle to reclaim the Anvil approaches, Cammie clashes with her teammates, while Val bonds with Kazu. Later, Chase uncovers a dark truth.

General Marin’s ruthless tactics come into question while the gen:LOCK team mourns one of their own. Later, Cammie’s search for answers leads her to Babylon.

As the gen:LOCK team prepares for their raid on RTASA, Miranda hatches a plan to appeal to Chase’s emotions, while General Marin confronts the Polity’s latest plot.

As Miranda and Chase head to New York to face off against the Twilight, Cammie and Caliban near a breakthrough that could help Henry crack gen:LOCK’s code.

As the Twilight ravages New York, Chase and the members of gen:LOCK face a fatal decision that could finally seal humanity’s fate.