Arquette

Arquette is the main antagonist of the Black Mirror episode Men against Fire. He is a military psychologist who supports the MASS system which at first seems to be an operation where the military protects the people from monstrous mutants called "Roaches", but there is a hidden and much more darker purpose behind the operation. He was portrayed by Michael Kelly, who also played Doug Stamper from House of Cards.

Men against Fire
When the protagonist Stripe feels ill after killing a few monsters known as "Roaches", he is sent to a meeting with Arquette to make sure that his Mass (a chip in the brain that can make soldiers visualize things such as maps, calls, aiming view, data, etc.) is working.

When Stripe returns to his mission with a damaged Mass and notices that the Roaches they are sent to kill are just normal human beings that are just being visualized by the Masses as monstrous mutants, thus making the soldiers see monsters instead of humans.

When stripe is arrested for helping the Roaches (whom he now knows are human beings), he is sent to Arquette again and reveals to Stripe that the true purpose of the MASS system is to exterminate people that are considered inferior and that they are only visualized as monsters by the Masses so that the soldiers won't hesitate in killing them.

When Stripe gets violent, Arquette controls his Mass with a remote and repeats the memory in Stripes head for him when he killed the Roaches, but this time he sees them in their true forms as humans.

Realizing that he all this time killed innocent people, Stripe falls on the floor feeling sick, and Arquette offers him to the chance to either have the last few days erased from his memory and continue to massacre Roaches, or being sent to an isolated room with his memory of brutally killing the innocents being repeated in his head. Stripe had no choice and eventually agreed to go with option one.