"Chibaku Tensei " (地爆天星, Chibaku Tensei) is chapter 439 of the original Naruto manga.
Over Konan's objections, Nagato uses Chibaku Tensei through the Deva Path, further weakening his already frail body. Naruto, in a six-tailed form, is caught in a giant sphere of debris. He enters an eight-tailed form to escape, but even then he has difficulty. Frustrated, Naruto, within his subconscious, cries out for help. The Nine-Tails offers to destroy Naruto's enemies if he lets it go. Naruto prepares to remove the seal keeping the Nine-Tails contained, but is stopped by the Fourth Hokage, who thanks the Nine-Tails and its bad influence for giving him a chance to see his son.