Ko Sai, a female Kaminoan, was Chief Scientist of the creation of the Grand Army of the Republic. It was her responsibility to ensure that the clones were of the highest quality, overseeing all the biological aspects of the project. She also directed the 'processing' of the clones that failed to meet her expectations.

Following the First Battle of Kamino, she told Yoda more about the source of funding for the army—a man called Tyranus. At some point later, she met with the Supreme Chancellor Palpatine who disturbed her greatly and wanted her research to extend his life indefinitely.

A year and a half into the war, she defected to the Separatists and soon, Clone commandos and ARC troopers were deployed to find the scientist before she could reveal any cloning information to the Confederacy. However, she quickly abandoned the CIS as well and became independent, fleeing both the Separatists and the Republic to continue her work in secrecy.

<b>Master</b>
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Taught by the Team Coach.

<b>Awards</b>
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<b>Season Two</b>
None

<b>Padawans</b>
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None