Ahsoka Tano fought Darth Vader on Malachor V during the events of Star Wars: Rebels season 2, in the season 2 finale entitled Twilight of the Apprentice. The fight took place on 3 BBY, meaning it happened three years before the events of Star Wars Episode IV: A New Hope. The confrontation between Ahsoka and Vader in Twilight of the Apprentice is considered the best episode of Star Wars Rebels.