In the popular Netflix series Stranger Things, the character known as 001 was Dr. Martin Brenner. Dr. Brenner was a scientist who worked at Hawkins National Laboratory, a top-secret government facility located in Hawkins, Indiana.

As a scientist, Dr. Brenner was involved in research on psychokinetic abilities and how to harness them for government purposes. He was also the leader of a project known as MKUltra, which aimed to create mind-controlled agents for use in the Cold War.
In the first season of Stranger Things, Dr. Brenner is introduced as a key player in the plot. He is seen as the leader of a group of scientists who are experimenting on a young girl named Eleven, who possesses powerful psychokinetic abilities. Brenner is portrayed as a cold and calculating individual who is willing to go to any lengths to achieve his goals.
Throughout the season, Brenner is shown to have a complicated relationship with Eleven. He initially appears to be kind to her and even takes on a paternal role, but it is soon revealed that he is using her for his own purposes. When Eleven escapes from the laboratory and runs away, Brenner is shown to be desperate to find her, indicating that he is aware of the danger she poses to his project.
In the second season of the show, it is revealed that Brenner survived the events of the first season, despite being attacked by the monster known as the Demogorgon. However, he is now on the run and is being hunted by both the government and the creatures from the Upside Down.
It is also revealed that Brenner was involved in a project known as “Six,” which involved a group of other children who possessed psychokinetic abilities similar to Eleven’s. Brenner is shown to have been ruthless in his treatment of these children, subjecting them to harsh experiments and using them as test subjects for his project.
Despite his apparent death in the first season, Brenner’s role in the story of Stranger Things has continued to be important. He is often referenced by other characters, and his actions continue to have an impact on the lives of those around him.
In conclusion, Dr. Martin Brenner, also known as 001, was a key character in the first season of Stranger Things. He was a scientist who worked at Hawkins National Laboratory and was involved in research on psychokinetic abilities. Brenner was portrayed as a cold and calculating individual who was willing to go to any lengths to achieve his goals. He played a crucial role in the story of the show and his actions continue to have an impact on the lives of the other characters.