After losing out to the Flag-Smashers in their initial meeting during episode two of The Falcon and the Winter Soldier, Sam and Bucky realize the group doesn’t just have one supersoldier, it has eight. The source of their power happens to be the same serum that gave both Steve and Bucky their superstrength. To track down leads as to how the Flag-Smashers got their hands on the serum, Bucky takes Sam to Isaiah Bradley, who, according to Bucky, “was a hero. One of the ones HYDRA feared the most. Like Steve.”
In the comics, Isaiah Bradley is known as the first Black Captain America. As part of Project Rebirth’s attempt to re-create the supersoldier serum, Isaiah is the only survivor from an initial pool of 300 Black soldiers used as test subjects. Isaiah’s supersoldier origin story, including the experiment and the treatment of its subjects, is an allusion to the Tuskegee Syphilis Study, which was an unethical study conducted from 1932-1972 that observed the natural progression of untreated syphilis. Sent on a suicide mission to destroy the German supersoldier program, Isaiah steals a Captain America costume and shield before heading out to complete his mission.
Source: Read Full Article