Who is the blonde that said Captain America saved you in movie avengers?

You're likely thinking of Natasha Romanoff (Black Widow) in *Avengers: Endgame*. She says, "He saved us" to a confused Steve Rogers, referencing the events of *Avengers: Infinity War*.

It's important to note that although Black Widow has blonde hair in *Avengers: Endgame*, she doesn't have it in the original *Avengers* film.