In the fourth episode of “Tales of the Jedi,” entitled “The Sith Lord,” Yaddle has quite an impact on “Star Wars” canon. Count Dooku, who has long since left the Jedi Order, laments the loss of his old padawan, Qui-Gon Jinn. He finds himself talking to Master Yaddle (voiced to perfection by Bryce Dallas Howard) in the halls of the Jedi temple on Coruscant. Something about Dooku’s manner is suspicious to her, though, and she follows him to the industrial quarter of Coruscant where Dooku holds his clandestine meetings with Darth Sidious, secretly Chancellor Palpatine, in a location we see years later in “Attack of the Clones.”
As Dooku struggles with his position in the galaxy and with the choices he’s made to be in league with the Sith, he’s given a choice to join the Sith, but to do so, he has to confront Yaddle and prevent her from revealing their dark secrets. This is difficult for Dooku and made even more difficult because Yaddle offers him amnesty for his crimes and is willing to bring him back into the fold of the Jedi order.
Ultimately, he rejects her pleas, the two of them have a lightsaber duel, and Dooku is forced to brutally murder the Jedi Master, becoming the apprentice of Darth Sidious once and for all.