In episode 24, when Zoisite discovered that Nephrite has fallen in love with Naru, and possibly betrayed the Dark Kingdom, he sent the Plant Sisters after Naru to kidnap her so Nephrite would come and save her, giving them the chance to kill him. Nephrite did come to save her (right after discovering that Usagi was Sailor Moon), and beat them up, nearly killing Grape (the one that shoots thorns from her hands) with a sword.