The crew learns the Zhat Vash's ancient warning and Oh's role in the Mars attack, while Seven helps Elnor defend the Artifact.
Jurati wakes and, after meeting Soji, gives up any plan to harm her. Rios reveals that his former captain killed two synthetic envoys on Starfleet orders before taking his own life, and one of them looked like Soji.
Raffi works out that the Romulans found an ancient warning about advanced synthetic life, and that the Zhat Vash placed Oh, who is half Romulan, in Starfleet, where she arranged the Mars attack. Soji remembers her homeworld and sets a course. On the Artifact, Seven links with former drones in stasis to help Elnor fight the Romulans, but the Romulans vent them into space. Michael Chabon wrote the episode and Maja Vrvilo directed.