Impossible Dream (叶わぬ夢, Kanawanu Yume) is episode 27 of the Naruto: Shippūden anime.
Chiyo injects the last remaining antidote into Sakura, and finally kills Sasori by stabbing him through his core using the "Father" and "Mother" puppets. With Sasori immobilised, Chiyo revives the nearly-dead Sakura using her Reincarnation Ninjutsu. As he dies, Sasori tells Sakura where he had planned to meet with one of his spies, who had been secretly working as one of his former Akatsuki partner, Orochimaru's, subordinate. Meanwhile, as Kakashi and Naruto are pursuing Deidara, Kakashi reveals his plan to activate his version of the Mangekyō Sharingan.