Stranger Things: Who Is The American?
5. Dr. Sam Owens
Dr. Sam Owens was the high-ranking researcher of the US Department of Energy who took over for Brenner at the Hawkins Lab, tasked with cleaning up the carnage from the first season.
In season two he was there to treat Will, help everyone escape the lab, and even assisted in Eleven becoming Hopper's legal daughter. He makes a brief appearance in season three which becomes very interesting in the grand scheme of things.
Dr. Owens and the US Army show up conveniently late to the Starcourt Mall, helping get everyone out of the Russian facility. He also surveys the damage of the closed gate to the Upside Down.
With the help of the military and government, Dr. Owens covers up the shenanigans involving the Mind Flayer and Russians. They falsify a claim that the mall had simply burnt down in a fire, and that the deaths came as a result of it.
In the "Cutting Edge" vignette there are forged images showing only a few police officers and firefighters present at Starcourt, as opposed to the United States Military who were actually on the scene. This indirectly contributed to knowledge of the various coverups in Hawkins, and may even have put Owens on the Russian's radar, leading to his capture.