Beyoncé’s fictional alter ego introduced with I Am... Sasha Fierce was Sasha Fierce.
The 2008 album was presented as a two-disc project. The I Am... disc emphasized more personal and emotionally exposed material, while the Sasha Fierce disc represented a bolder, more confident performance persona. Beyoncé described Sasha Fierce as an alter ego that appeared when she performed.
The concept helped frame the album’s contrast between intimate songs and high-energy pop and R&B tracks. Its best-known singles included “If I Were a Boy,” “Single Ladies (Put a Ring on It),” “Halo,” and “Diva.” The album became one of Beyoncé’s largest commercial releases of the 2000s.
Sasha Fierce was not a separate artist or a second singer. It was a stage persona associated with Beyoncé’s performance identity during that era. Beyoncé later said she had retired the alter ego, explaining that she no longer needed to rely on a separate character to access confidence onstage.