Olsen starred in the 2015 superhero film ', a sequel to "The Avengers", joining the Marvel Cinematic Universe media franchise and rising to fame. In the film, she portrayed Wanda Maximoff / Scarlet Witch, which marked the comic book character's film debut. She first appeared as the character in a post-credits scene of the 2014 film ', alongside Taylor-Johnson, who portrayed Scarlet Witch's brother, Pietro Maximoff / Quicksilver. Olsen played the part with an accent originating from a fictional country called Sokovia, which she described as similar to Slovakian. She reprised the role in ' (2016), ' (2018), and "" (2019), the last of which became the second highest-grossing film of all time.