John and Sarah are pursued by Cameron herself after an explosion reboots her termination directive. The Turk falls into the hands of a corporate CEO with an agenda, and Agent Ellison struggles with the aftermath of Cromartie's massacre.
Sarah and Cameron investigate a nuclear power plant when a dying man from the future brings an unclear warning. John's disillusion with school leads him to a new friend, Riley.
Charley pleads for help after Cromartie kidnaps his wife, bringing Sarah and Derek out of hiding. John tries to ditch Cameron in order to spend time with Riley.
Cameron falls in with a street thief after losing her memories and her knowledge of what she is. Sarah takes Casey to the hospital with potential complications to her pregnancy, and Ellison digs into Catherine Weaver's past.
Derek and John visit a military prep school to protect a young man who will one day train John and help establish the Resistance. Meanwhile, Sarah and Cameron try to protect a young boy targeted by a T-888 because he happens to have the same name.
The Connors investigate a family therapist with a future connection to SkyNet by becoming his patients, unaware that he is also treating Catherine Weaver – secretly a Terminator – and her "daughter."
While Sarah and Cameron track a burglar to recover the family's stolen IDs, Cromartie uses Cameron's friend Jody to track the Connors. Ellison is arrested for a murder he didn't commit after he encounters a Terminator that looks just like him.
Jesse captures a man who she believes works for SkyNet, and has been sent back from the future – though he claims to be someone else. Sarah falls ill and begins to experience disturbing nightmares.
The three dots lead Sarah to a tech start-up, where she poses as a wealthy investor to get her hands on a cutting-edge microchip. Ellison investigates a death at Zeira Corp that may have been caused by the company's new emerging A.I.
Cameron discovers records of a T-888 in the 1920s, and tries to figure out who he was and why he was there. Things turn ugly when Riley brings John to a party.
Sarah visits a UFO enthusiasts conference to find info on the three dots, leading her to a blogger who is in hiding. Riley makes a fateful choice after clashing with Jessi.
After waking up with a bullet in her leg Sarah kidnaps a doctor for help, with a vision of Kyle Reese keeping her company. John Henry surprises Ellison and Weaver with what he has learned about them.
Following the factory explosion Sarah and the others look for leads among the grieving families of its employees. But the presence of an investigator from Zeira Corp complicates things.
Plagued by nightmares of being held captive by the man she killed, Sarah visits a sleep clinic to clear her head – only to find a new potential threat inside.
Riley fears that Cameron is going to kill her after she sees her expose her metal endoskeleton. Sarah pays a visit to Riley's foster parents to learn more about her.
After a friend turns up dead, suspicion falls on Cameron as the killer. Jesse remembers a dangerous submarine mission from her past, and Zeira Corp runs into a problem with John Henry.
As the family prepares to move to a safe house, Sarah takes John to see Charley. Zeira Corp is forced to shut down John Henry after he is compromised, and Cameron reveals a secret to Derek.
A new lead brings Sarah and John to Catherine Weaver's home, just in time to save her 6-year-old daughter from a Terminator attack. Ellison takes charge of the investigation, bringing him face-to-face with Sarah again.
John considers whether to try and free his mother after she is taken into custody. Weaver tries to arrange a meeting with John, and reveals the truth of her intentions.
