Natasha Romanoff is a fictional character portrayed by Scarlett Johansson in the Marvel Cinematic Universe (MCU) film franchise—based on the Marvel Comics character of the same name—sometimes known by her alter ego, Black Widow. Romanoff is a spy and an expert hand-to-hand combatant, trained in the Red Room from childhood. She eventually becomes part of the counter-terrorism agency S.H.I.E.L.D. (Strategic Homeland Intervention Enforcement and Logistics Division), through which the character was introduced to the franchise in Iron Man 2, and then of the Avengers, defending her teammates and the Earth against various threats. In 2020, the character will headline her own film, Black Widow.