Flashing in and out of consciousness, fighting for his life Derek Reese recalls his future life battling the machines in 2027. Meanwhile, Sarah tries to explain the past to Charley.

John and Derek infiltrate a military academy in order to protect an integral member of the future resistance. Meanwhile, Weaver’s first assignment for Ellison takes an interesting turn of events when he discovers a specter from his own past.

Sarah's quest to find the meaning behind the "three dots" leads to a technology firm seeking an advanced microchip. Meanwhile, Jesse comes clean to Derek about her mission and Weaver makes an important introduction.

While fighting to stay alive, Sarah is guided by the image of John's father. Weaver's attempt to protect John Henry has deadly consequences.

As the Connors prepare to move, they find out that Riley is dead, and Sarah begins to doubt Cameron's motives. Jesse flashes back to a submarine mission in the future, and John Henry plays hide and seek with Catherine Weaver's daughter.

Jesse's submarine mission in the future takes a fatal turn with unforeseen consequences. Back in the present, her plan to turn John against Cameron backfires when John discovers that Jesse--not Cameron--killed Riley and he makes a life-or-death decision.