The Force -Marvel-

Hydra, an organization founded on the belief that people could not be trusted with their own freedom, had no regard for human life. One day, when a stealth mission by SHIELD accidentally uncovered a young girl in their care, everything changed.

Upon returning her to a safe environment, the deprogramming began, and Natasha Romanoff entered her life.

Captain America Civil War (Age of Ultron Flashbacks)
Avengers Infinity War
Avengers Endgame

I do not own Marvel. All credit goes to Stan Lee and all its writers.