Star Wars: The Clone Wars - Season 3 Episode 16 -

Before the Jedi can leave Mortis, the Son takes Ahsoka captive in an attempt to entice Anakin into joining him to use their combined strength to overpower his Father and Sister. To this end, the Son casts Ahsoka under the spell of the dark side and she battles Anakin, when he comes to rescue her, and is later battled with Obi-wan. After a battle between the Son and the Daughter stopped by the Father, Ahsoka steals the dagger that controls the Son. The Son is about to kill the Father, but the Daughter sacrifices herself to save the Father and returns Ahsoka to normal as well by the Daughter transferring her life to Ahsoka.