John goes stir-crazy when he's confined to the house, Sarah looks up an old friend for some help, but she may face betrayal, and Cromartie begins reassembling himself.
John and Cameron start their new school, Sarah befriends a man who may be important to Sky Net and then struggles with what she must do. Meanwhile, Cromartie has tracked down a scientist to assist him in his regeneration.
When they learn of a huge shipment of Coltan arriving at the Port of Los Angeles, Sarah, John and Cameron believe that Cromartie has returned but upon investigation discover an entirely new Terminator with a mission of it's own.
Sarah is troubled to learn that Andy Goode has rebuilt his computer the Turk II and entered it into a chess competition with a military contract as the winning prize. A Resistance fighter from the future takes matters into his own hands.
Desperate to save Derek Reese's life, John enlists the help of Charley Dixon but the paramedic struggles to come to terms with time travelers and Terminators. In the future Derek fights to survive when he's separated from his brother Kyle.
As Derek Reese recovers from his injuries, Sarah attempts to retrieve the severed Terminator hand and Cameron tracks down Dmitri Shipkov. Meanwhile FBI agent James Ellison pays a visit to Dr. Silberman to learn more about Sarah's past.
Sarah finds herself in a transaction with a mysterious man named Sarkissian, who claims to be in possession of the stolen Turk. Derek recalls his childhood. Ellison discovers that the terminator Cromartie is impersonating an FBI agent.
John and Derek sign on for military school to protect a key future Resistance hero from termination. Back at home, Sarah and Cameron protect a young boy who shares the same name as the intended target.
Sarah, Derek and Cameron try to prevent a nuclear meltdown, Charley has to fill in Michelle when James shows up at their home, and John meets someone new.
John finds himself battling an unlikely opponent alone; Derek and Charley search for the family after an explosion; and Ellison deals with the aftermath of Cromartie's massacre.
Cromartie uses Charley and Michelle in a plot to lure Sarah into the desert and leave John alone and vulnerable in the city. Meanwhile, Catherine Weaver has a job proposal for Agent Ellison.
Sarah's quest to find the meaning behind the "three dots" leads to a technology firm seeking an advanced microchip. Dr. Sherman is killed while working with Catherine Weaver's A.I. computer, and Jesse comes clean about her mission.
Cameron learns that a terminator was accidentally sent back to 1920s Los Angeles, and she tries to find out what happened to him. Meanwhile, John has a run-in with a group of punks while taking Riley home from a party.
Terminators come after a family whose unborn daughter plays an important role in the war against the Machines, and Sarah, Cameron, and Derek try to protect them.
Sarah turns to a UFO convention for answers about the "three dots," more details about Riley's mission are revealed, and Ellison begins working with Catherine Weaver's AI prototype, "John Henry."
Another malfunction causes Cameron to believe that she is actually a human from the future named Allison. Sarah accompanies her pregnant landlady to the hospital. Ellison continues to contemplate Catherine Weaver's job offer.
While Sarah and Cameron search for the person who robbed the house, Cromartie returns to hunt down Cameron and John. Meanwhile, a new cyborg arrives and creates trouble for Ellison.
Cromartie kidnaps Sarah and races to Mexico to find John. When Derek, Cameron and Ellison discover what has happened, they come to their defense - which leads to one final, deadly confrontation with Cromartie.
Sarah turns to Dr. Sherman when she begins having nightmares, Jesse tries to convince Derek that she has captured an important figure from the future, and John and Cameron discover that Cromartie's body is missing.
Sarah has visions of John's dead father as she tries to find a doctor to remove a bullet from her leg, Jesse removes Riley from the hospital after her suicide attempt, and Catherine covers her tracks after a secret location is identified.
Sarah attends a memorial service for Catherine Weaver's victims at the supposed heating and air conditioning plant to search for answers and find a connection to Skynet.
Sarah suspects that something fishy is going on at the medical clinic where she is being treated for insomnia. During her stay, she has flashbacks to a run-in she had with a man from the plant whom she thought she had already killed.
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