Aaron Copley

Aaron Copley was a physician and scientist working in Wales. He captured alien species, and tried to create vaccines for human illnesses. He knew they were going to die but he needed to find a way to cure uncurable human illness and he used a species called the Mayfly. He also had a Weevil in containment.

He shot and killed Owen Harper and was shot in the head by Captain Jack moments later while threatening to shoot Martha Jones. To his death, he still maintained the fact that what he was doing will work out in the end and that he was close to a "breakthrough". (TW: Reset)