“Massacre” is the nineteenth episode of the Star Wars: The Clone Wars television series‘ fourth season. This is the first episode in a four-part storyline about the fate of Asajj Ventress, the Nightsisters, and two of the Nightbrothers. It aired on February 24, 2012.
“Count Dooku is determined to have revenge against the Nightsisters of Dathomir after their betrayal. General Grievous launches an all-out droid attack against the magic-wielding witches, and Mother Talzin and Asajj Ventress lead the defense with all the dark powers at their command.”