Portrayed by Kaya Scodelario.
Teresa Agnes is the first and only female Glader.
The Maze Runner[]
Sometime after Thomas arrived in the Glade, Teresa arrives in the Glade. Newt jumps down into the Box, takes a note from Teresa's hand, and reads the words "She's the last one ever" on it. Teresa suddenly wakes up, recognizes Thomas, says his name, and goes back to sleep.
Later, after waking up, Teresa flees to the top of the tower and throws rocks at the other Gladers. Thomas stops her and goes up to talk to her, while the other Gladers leave. When Thomas asks Teresa why they are different, Teresa takes out two vials of serum she had with her when she arrived in the Glade and gives them to Thomas. Thomas sees that the two vials of serum have the letters W.C.K.D. on them, leading Teresa to wonder if she, Thomas, and the other Gladers were sent to the Glade for a reason.
At night, in the medical hut, Alby starts attacking Thomas, but Newt, Jeff, and Clint manage to restrain him, allowing Teresa to inject him in the chest with the serum. Teresa watches over Alby along with Newt, Jeff, and Clint while Gally escorts Thomas to the Pit.
The next day, when Thomas and Minho return to the Glade, Thomas and Gally start arguing with each other, when Teresa calls out to them and the Gladers and tells them that Alby is awake.
In the medical hut, Teresa, along with Newt, Minho, Gally, and Frypan, watch on as Alby tells Thomas that he remembers that Thomas worked for WCKD.
At night, during the Grievers' attack on the Glade, Teresa, along with Thomas, Newt, Minho, Frypan, Alby, Chuck, Winston, Jeff, and Clint, hide in the Council Hall from the Grievers. Teresa watches Clint get killed by a Griever. Chuck is caught by a Griever, but Alby sacrifices himself to save him.
After the attack, Gally punches Thomas in the face in far more rage, violence, and aggressiveness than before, blaming him for everything that has happened. When Thomas uses a Griever stinger to stab himself in the thigh to regain his memories, Teresa tends to him along with Newt, Minho, Frypan, Chuck, Winston, and Jeff.
The next day, Teresa is told by Thomas along with Newt, Minho, Frypan, Chuck, Winston, and Jeff that she and him worked for WCKD and created the Maze.
Gally, having taken command, crosses out Alby's name on the wall, has Teresa tied to a pole, and attempts to have Thomas tied to another pole. Teresa kicks a Glader in the groin, allowing Frypan to cut her free, while Thomas fights off two Gladers and Newt knocks down a Glader. Teresa escapes along with her group of Gladers while Gally stays with his own group of Gladers in the Glade.
Teresa helps her group of Gladers fight off the Grievers, but Jeff dies trying to save Minho from a Griever. Teresa, along with her group of Gladers, go into the WCKD lab and watch a video left by Ava Paige, who shoots herself at the end of the video.
Teresa is about to leave along with her group of Gladers when Gally, having been stung by a Griever, appears with a gun and insists that they will never be free. Gally fires a bullet at Thomas, but Chuck sacrifices himself by taking the bullet in the chest, giving Minho a chance to throw a spear at Gally, causing it to non-fatally impale him in the chest, causing Gally to drop to his knees, drop the gun, and collapse on his right side on the floor. Teresa watches Chuck die in Thomas' arms before being taken along with her group of Gladers to a helicopter by a group of masked soldiers.
Maze Runner: The Death Cure[]
Teresa works as a scientist for WCKD. She watches Minho being put through programmed trials by WCKD so they can extract his blood.
At night, Teresa visits a little girl named Cheyenne in the medical wing and injects the serum containing Minho's blood into her arm and she recovers.
The next night, Teresa visits Minho in a room and tells him that Cheyenne has been infected for three weeks and that Minho can save her and everyone else. But when Teresa is about to leave the room, Minho attacks her, screaming at her for being a traitor. The WCKD soldiers restrain him, but not before Minho grabs a metal hair clip from Teresa. Teresa discovers that the serum has failed on Cheyenne, as she has now become a Crank.
When Teresa leaves the WCKD tower, she sees Thomas on the other side of the street. She follows him into an alley and they talk. After they finish talking, Thomas signals for Gally to put a sack on Teresa. Teresa is taken by Thomas and Gally to an abandoned church where Newt, Frypan, Brenda, and Jorge are. Teresa is shocked to see that Gally is alive, and Gally asks her where Minho is. Teresa replies that Minho is in Sub-Level 3 with the Immune children. Gally takes a scalpel and tries to use it to cut off Teresa's finger, but Thomas takes the scalpel from him. Thomas convinces Teresa to remove their trackers.
While removing Thomas' tracker, Teresa discovers that Brenda is looking good and healthy and asks Thomas when her last treatment was. Thomas replies that Brenda's last treatment was back in the mountain camp of the Right Arm. Teresa removes Thomas' tracker. Gally approaches Teresa and Thomas and asks them if everything is okay. Thomas replies that everything is okay. Teresa tries to pick up a scalpel from the table, but Gally stops her and takes her outside, but not before Teresa grabs a cloth with Thomas' blood on it from the table.
Teresa, along with Thomas, Newt, and Gally, go to the WCKD tower, while Frypan climbs up a crane, Brenda goes to a parking lot to steal a bus, and Jorge returns to the Right Arm's hideout.
While Gally enters the WCKD tower through the parking garage, Teresa, along with Thomas and Newt, enter the WCKD tower through the main entrance.
Teresa arrives in a stairwell along with Thomas, Newt, and Gally. While Thomas talks to Frypan and Brenda on a walkie-talkie and Gally plugs a jamming device into an electrical box, Teresa watches as Newt starts coughing due to being infected by the Flare.
Teresa, along with Thomas, Newt, and Gally, arrive in Sub-Level 3 where Thomas, Newt, and Gally shoot the WCKD guards, Thomas discovers that Minho is not in the cell and asks Teresa where he is. Teresa shows Thomas Minho's profile and tells him that Minho has been moved up to the medical wing. Teresa goes to find Minho along with Thomas and Newt, while Gally takes the vials of serum out of the vault and takes them and the Immune children to Brenda.
Teresa, along with Thomas and Newt, take the elevator to find Minho, Janson joins them in the elevator and talks to Teresa, but then realizes that Thomas and Newt are in the elevator, but Teresa manages to escape along with Thomas and Newt. When Thomas asks when the Flare will stop, Teresa replies that it stop when WCKD finds a cure. Thomas replies that there is no cure. Janson holds them at gunpoint, but Teresa manages to let Thomas and Newt go to find Minho while she goes to do a blood test on Thomas' blood.
Teresa examines Thomas' blood and finds that it not only keeps the Flare virus in check, but also destroys it. She reveals this to Ava Paige and suggests that they find Thomas.
While Thomas is dragging Newt to the berg, Teresa broadcasts her voice throughout the Last City, telling Thomas that his blood can cure Newt like it did Brenda and that he needs to return to WCKD.
After Thomas kills Newt, he returns to the WCKD tower where he talks to Ava Paige. Paige tells Thomas that he save them, but is shot in the back by Janson, who takes Thomas to a lab where Teresa is extracting his blood. Janson reveals to Thomas that he has been infected by the Flare and plans to inject the serum with Thomas' blood into his arm, causing Teresa to hit Janson in the head with a glass flask, knocking him unconscious. Teresa tries to release Thomas, but Janson regains consciousness and knocks Teresa down. Thomas frees himself and engages Janson in a fight, but Janson overpowers him and prepares to shoot him, when Lawrence's crew fires a missile at the WCKD tower, knocking Teresa, Thomas, and Janson down. Teresa carries Thomas to the medical wing, but not before Janson shoots Thomas in the stomach. Teresa offers to give Janson the serum containing Thomas' blood, but Janson refuses and wants Thomas himself. Thomas throws a very heavy object at a glass front, allowing the Cranks that are locked inside it to break out and attack Janson. Teresa carries Thomas to the roof, where she gives him the serum containing his blood and kisses him. Minho, Gally, Frypan, Brenda, Jorge, Vince, and the Immune children arrive in a berg. Thomas is unable to get on the berg due to his wound, but Teresa manages to throw him onto the ramp of the berg, allowing Minho, Gally, Frypan, Brenda, and Vince to pull him aboard. Teresa falls to her death when the WCKD tower collapses.
Sometime later at the Safe Haven, Teresa's name was engraved on the memorial rock by Thomas.
