When Sarah's friend Andy submits his computer into a chess competition, she revaluates his computer's capabilities and worries where it could all lead. During the chess match, Sarah comes face-to-face with a stranger whose history is closely tied to hers. Meanwhile at school, Cameron gets called into grief counseling and John makes a new friend in shop class. Agent Ellison discovers remnants from a terminator battle.

When Sarah breaks into Agent Ellison's apartment looking for a missing endo-arm, she discovers dossiers, files and video from her stay in the mental hospital. The files lead her to hospital psychiatrist Dr. Silverman, a doomsday convert who made Sarah's hospital stay unbearable. Meanwhile, Cameron enrolls in a ballet class taught by Maria Shipkov, Dmitri's sister, in an effort to track down his whereabouts and to find out who has the Turk. John learns what it took for his mom to escape the hospital; Agent Ellison's endo-arm discovery puts him danger.