"Stop Nagato!!" (長門を止めろ!!, Nagato o Tomero!!) is chapter 551 of the original Naruto manga.
Summary
As Nagato tries to pull out Naruto's soul, Naruto realises Nagato is using all of Pain's powers in one body. Naruto asks Nagato how his techniques work, but soon realises Nagato is being fully controlled. Naruto tries to escape by attacking Nagato with a Rasengan but he absorbs it. B moves to help Naruto but Nagato sees the attack coming and captures B. Just as Nagato is about to remove Naruto's soul and kill B, Itachi saves them with his incomplete Susanoo. Kabuto remembers he has one more person to capture and has Nagato use Chibaku Tensei on all three of them. Naruto remembers the technique and tells B and Itachi about it. Itachi figures out its weakness and tells the others to use their strongest long-range attacks. As the sphere is destroyed Itachi stabs Nagato with the Sword of Totsuka, causing Nagato to regain consciousness. As he is sealed, Itachi tells him that if he had anything left to say he should say it now. Nagato tells Naruto that he is the last part of the three part legacy following Jiraiya — whose story was perfect, himself — which he deemed a failure. He then tells Naruto to make his story perfect so that everyone forgot his own horrible story.