Martha is first seen in action with UNIT in "The Sontaran Stratagem", where Donna Noble, the Doctor's current companion, reacts with shock asking derisively if the Doctor turns all of his companions into "soldiers". The Doctor also appears to disapprove over the situation until Martha defends her intentions, reminding the Doctor that she herself does not carry a gun, and stating that she is trying to make UNIT "better" from the inside. Agyeman herself states that she was never in any worry about Martha becoming too gun-toting: "I never felt any danger of that happening. At the end of Series Three, she'd struggled for a year, and travelled alone, and saw all this hardship, her family tortured... that's going to have affected her. At the same time, she's continued in her studies to become a doctor, so obviously she still has this caring side to her".