Which actress played Natasha Romanoff/Black Widow in the Marvel Cinematic Universe?

Scarlett Johansson played Natasha Romanoff/Black Widow in nine MCU films between 2010 and 2021. Interestingly, Emily Blunt was originally cast in the role but had to turn it down due to contractual commitments to 'Gulliver's Travels'. Johansson, initially disappointed at not landing the role of Lisbeth Salander in 'The Girl with the Dragon Tattoo', accepted the role after a meeting with Jon Favreau.