Tula

Tula was a human female who served as an officer of the Galactic Empire during the Galactic Civil War, even after the Imperials destroyed her homeworld of Alderaan. Tula manipulated her sister, Tace, into providing the Empire with intelligence on the activities of Princess Leia Organa, who was attempting to rescue the survivors of Alderaan. Organa became aware of Tula's manipulation of Tace after Imperial forces attacked the princess while she visited the Alderaan Enclave on the planet Sullust.

Organa then had Tace try and question her sister, but Tula's commanding officer, Dreed, realized what was happening and had Tula taken away by stormtroopers for processing. Organa negotiated with Dreed to exchange herself for Tula on the planet Skaradosh, but once there, the princess had her allies swoop in and kill Dreed and his men. Tula was then reunited with her sister but found Tace angry over her betrayal. The sisters were reconciled to some extent during a battle between Dreed's Star Destroyer and the Alderaanians gathered by Organa above the planet Espirion, which ended in the Imperial vessel's destruction.

Text and facts from the “Tula” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.