Stream of consciousness rationale: The important part for answering this question is: Scarlett Johansson portrayed the character in the films Iron Man 2 (2010), The Avengers (2012), Captain America: The Winter Soldier (2014), Avengers: Age of Ultron (2015), Captain America: Civil War (2016), Avengers: Infinity War (2018) and the Untitled Avengers film (2019) as a part of the Marvel Cinematic Universe franchise.
The question and answer pair are described below.
Q: Scarlett Johansson portrayed the character in the films Iron Man 2 (2010), The Avengers (2012), Captain America: The Winter Soldier (2014), Avengers: Age of Ultron (2015), Captain America: Civil War (2016), Avengers: Infinity War (2018) and the Untitled Avengers film (2019) as a part of the Marvel Cinematic Universe franchise.

Answer this question based on the passage: who plays black widow in iron man 2?
A: Scarlett Johansson