While searching for some stolen cargo, John becomes separated from Sarah and Cameron. Meanwhile, Agent Ellison's murder investigation leads him to a surprising suspect. Can John prove himself as the great military leader he is supposed to be and stop SkyNet's plans?
Dr. Lyman, a plastic surgeon, hears a noise from his office. He finds Cromartie at a computer looking for the image of a man. Cromartie demands surgery.
Sarah tries to get John to talk about Jordan's death, but John stays closed. Cameron interrupts them and tells them Cromartie followed them. Cameron shows news video of when they arrived in Los Angeles, in the background is Cromartie's head. Cameron believes he has something to do with a shipment of Coltan metal, a key metal in Terminator endoskeletons, being rerouted. Sarah tells John to arm up. They're going to fight Cromartie.
John, Sarah and Cameron sneak watch workers load Coltan into a truck. Cameron verifies the crew is human, John and Sarah continue to plant C4 charges. John and Sarah see a guard walk into the warehouse. Cameron grabs him from behind and knocks him out. The truck with the Coltan drives off.
They follow the truck and watch the workers. A fourth man enters and tells the three other men to leave. When the three leave, the fourth man grabs a shipment of the super-heavy Coltan and moves it like it's nothing. Cameron scans the man. He's a Terminator, but not Cromartie.
Agent Ellison arrives at Dr. Lyman's office. Lyman was murdered and blood at the scene matches Ellison's strange blood samples. Ellison and the detective watch video footage of Cromartie entering the office Friday night, and leaving Sunday morning, but he has a new face. An office manager brings a file containing images of patient George Laszlo. The images match Cromartie's new face.
John wants to destroy this new Terminator. Sarah wants to back off because they're out numbered and don't have a plan. Cameron agrees with Sarah. Sarah and Cameron get in the Jeep, then turn to see John climbing in the window.
John sneaks into the truck carrying the Coltan. He hides his cell phone in one of the crates. Before he can get out of the truck, the men return and John gets locked inside, along with one of the men.
Another worker holds Cameron and Sarah at gun point. Sarah knocks the man out. Before Sarah and Cameron can get through the warehouse, the truck with John is gone.
Sarah and Cameron track John's phone online. In the truck, John watches his phone shake loose, and smashes on the truck bed. Sarah and Cameron lose the signal. The man in the truck sees the phone. When he bends to grab it, John knocks him out with a piece of Coltan. Sarah panics. John tries to pick the lock on the truck but fails.
Ellison tells Agent Simpson that Laszlo's record is clean. A younger agent, Agent Stewart, stands in the doorway. Ellison walks with Stewart to a holding room where Laszlo is awaiting interrogation. In the room, Ellison sits across from Laszlo. Laszlo stays quiet. A nurse arrives and Ellison asks Laszlo to donate some blood. Laszlo agrees.
Sarah roughs up the man she knocked out earlier, asking him where the truck went. She cuts him loose, and tells the man he can go, if he can get passed Cameron. Minutes later, the man drives an Army vehicle. They're heading to a gunnery range. The man doesn't know what the Terminator is doing there; he was just hired to clean up the warehouse.
Laszlo pulls off the bandage from the blood sample. There's a knock at his door. Cromartie is there and grabs Laszlo by the neck. He drags Laszlo to a mirror and compares his face. They're identical.
The two other men open the truck inside the warehouse. They think the third man has left and go to make a call. John looks around and sneaks out of the truck.
Ellison talks to a group of other agents about his case. Stewart notes that Laszlo's blood didn't match the blood sample in the lab. Ellison tells them he believes the person in the plastic surgery office may have been someone else trying to look like Laszlo. Stewart says that it's improbable because there was no change in the anesthesia levels. And the time needed to do the surgery would have killed any human without anesthesia.
John tries to make a break for it, but the two men and the Terminator return. The Terminator kills the two men, and then closes a massive blast door. The Terminator stands at the door and appears to power down.
Sarah and Cameron arrive at the depot where John is. Cameron notes that this is the location where she will be made in the future. They approach the blast door.
The third crew man comes too and finds John. He holds him at gun point. John tries to tell the man that his boss, the Terminator, killed the other two. The man runs out and pushes the Terminator to the ground. The Terminator stands, grabs the man by the neck and kills him. The Terminator faces forward and powers down again.
John carefully moves around the back of the warehouse to use a phone on the wall, he does it quietly, trying not to wake the machine. Sarah's cell phone rings and tells her what is going on inside. Sarah tells John that once the door opens, he must run. Cameron will handle the Terminator. The door is locked, and John has to get the key from around the sleeping Terminator's neck. John succeeds and opens the doors.
Cameron rushes in and knocks the Terminator to the ground. John tries to start the truck and drive it out. The Terminator pushes the truck from the front, holding them back. Sarah blasts him with a shotgun, freeing them and drives over his body. Cameron locks the door behind them and they drive off.
Ellison visits Laszlo's apartment to deliver a warning that someone might be trying to steal Laszlo's identity. Ellison, not knowing Cromartie is now Laszlo, gives Cromartie his card, and leaves.
Cameron races the truck off a bluff, destroying the evidence and hiding the shipment of Colton.
Back home, John goes to finish his homework. Cameron looks over a piece of Colton she took, curious about her creation. John's hand shakes as he realizes how close he came.