"I'll be there for you."
- Kaytoo's last words to Jyn Erso


K-2SO (Kay-Tuesso), abbreviated K-2 (Kay-Tu or Kaytoo) or Kay, was a KX-series security droid originally created for use in the Galactic Empire's armed forces. At some point, the droid encountered Captain Cassian Andor, a member of the resistance movement—known as the Rebel Alliance—that sought to overthrow the Empire and restore democracy to the galaxy. Andor was able to reprogram K-2SO to serve the Alliance. Kaytoo helped Andor, Jyn Erso, and the other teams of the team Rogue One. In 0 BBY, K-2SO participated in the Battle of Scarif, where he sacrificed himself so that Andor and Erso could steal the plans to the Empire's moon-sized battle station, the Death Star.

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