Tom McMullin

 was the pre-war supervisor of the facility which is known as Power Plant in The Pitt at the time of Fallout 3.

History
Despite his best efforts to stall the management-induced plans to replace his workers with Protectrons, his superiors finally caught on to his deceptions and ordered the plant to be vacated by human personell. The workers mistakenly believed McMullin had been helping the management with replacing them all along to save his own job and planned to take out their frustration on him. Tom suspected this though and tried to escape.

Although his escape failed, he managed to flee to a small room where he locked himself in, intending to wait for the workers to leave. The workers however did not want to leave until he came out. He begged them to leave before the new Protectron workforce arrived but they did not take him seriously. When the robots entered the plant they killed all workers; McMullin briefly left his room when he heard the noise but went back in again shortly after, horrified by what he had witnessed. Shocked, he sat and listened to the cries of the dying workers, unable to do as much as let those into his room which banged against the door.

After all the workers were dead, Tom McMullin did not want to leave the room again until the robots were gone. As a skeleton is found inside the locked room with the terminal telling his story, it can be assumed he died in there, either by starvation or suicide.

Appearances
Tom McMullin does not appear in any game. His account of the events inside The Pitt's Power Plant can be found in a terminal in the Fallout 3 DLC The Pitt.