https://www.polygon.com/2018/8/8/17663916/dark-samus-super-smash-bros-ultimate-echo-fighter

Dark Samus is coming to Super Smash Bros. Ultimate as an echo fighter, Nintendo announced today during the company’s Smash focused Nintendo Direct.

Dark Samus first appeared with a cameo in Metroid Prime, but became an integral part of the series as one of the primary antagonists in the Metroid Prime series.