Mary Cooper was a supporting character in Maze Runner: The Scorch Trials. A former scientist working for WCKD, she abandoned the organisation because she disagreed with their methods of harvesting children immune to the Flare virus. She would go on to form the Right Arm, a resistance movement fighting against WCKD to protect the Immunes. She was portrayed by Lili Taylor.
History[]
Mary is part of the Right Arm and serves as their doctor and right hand to Vince. She emerges from a tent in the base to stop Vince when he tries to shoot Brenda, who had been infected by a Crank bite. She greets Thomas and observes his reaction to her, noting that "They would put you in the Maze after what you'd done." When Thomas asks her to clarify, she explains that she used to work for WCKD and that the first time they met, he told her that he couldn't take it anymore, watching his friends get sent up and killed in the Maze after so many years. This made him turn over the information for all of the WCKD labs, bases, and warehouses to her and encouraged her to leave WCKD to try to stop them, thus forming the Right Arm.
Mary instructs volunteers from the group to help carry Brenda into the medical tent and she draws blood from Thomas to construct a temporary treatment for Brenda. She explains why WCKD was taking kids – the children were born with some kind of enzyme that made them immune to the Flare, which is why WCKD wanted to study the kids in situations like the Maze to see what would happen. Thomas asks if she's found a cure but she reveals that the problem is, the cure cannot be manmade, hence why WCKD is forced to harvest Immunes for the fluids and organs to try to concoct a cure. She injects Brenda with the mixture and explains that this is a temporary fix – Brenda will always need more. She and Jorge exit the tent to give Thomas time with Brenda, but she warns Thomas that Brenda cannot come with them.
Death[]
When WCKD invades the Right Arm's base, Mary is forced into a kneeling line with Vince and some of the other volunteers. She reveals herself to Ava Paige, declaring that at least she'll die with a conscience. The two speak briefly before A.D. Janson shoots her in the chest. Vince tries to stem the flow of blood but Mary dies in his arms.