The Fourth Shinobi World War: Climax arc is a massive, action-packed phase where the Allied Shinobi Forces clash directly with the resurrected Madara Uchiha, Obito, and the Ten-Tails. It features major historical reveals, the return of classic characters like the reincarnated Hokage, and escalates into a battle for the fate of humanity.
In Naruto, the "Return of the Hokages" refers to a climactic moment in the Fourth Great Ninja War where Orochimaru reanimates the first four Hokages (Hashirama, Tobirama, Hiruzen, and Minato) using the forbidden Edo Tensei jutsu. He achieves this by using the Uzumaki clan's Reaper Death Seal mask to slice open the Shinigami's stomach, freeing their trapped souls.Sasuke Uchiha requests this resurrection to seek the truth about the village and the shinobi system directly from the village founders. Hashirama Senju, the First Hokage, shares the history of the village's creation, deeply impacting Sasuke's choices. The revived leaders then immediately rush to the battlefield to join the war against Madara Uchiha.
Naruto, Killer Bee, Kakashi, and Guy engage in a grueling battle against the masked man known as Tobi, eventually unmasking him to reveal Kakashi's former teammate, Obito Uchiha
Obito and Madara successfully resurrect the Ten-Tails and begin to overpower the entire Shinobi Alliance, bringing the antagonists closer to casting the Infinite Tsukuyomi (a world-altering illusion).
Obito Uchiha resurrected the incomplete Ten-Tails by feeding its parts into the Demonic Statue of the Outer Path. He then deliberately had Kakashi destroy the seal on his heart to sever Madara’s control, allowing him to successfully perform a sealing jutsu to absorb the beast into his own body. As his body gave out, Obito performed the specific sealing technique to absorb the freshly revived Ten-Tails into himself. The overwhelming chakra of the Ten-Tails healed his fatal wounds and transformed him into the Ten-Tails Jinchūriki.
In the face of near-impossible odds, Naruto, Sasuke, and Sakura reunite to fight together as a squad for the first time since the early days of the series, sparking a new generation of power and cooperation.
After that madara betrayed obito by taking ten tals and renegan from him by using Black-Zetsu and become the new Jinchuriki of The Ten tails. Madara Uchiha succeeds in casting a global genjutsu called the Infinite Tsukuyomi, trapping almost all of humanity in a dream-like state.
Kaguya Ōtsutsuki returned during the Fourth Shinobi World War when her "son," Black Zetsu, betrayed Madara Uchiha. Acting as Kaguya’s will incarnate, Zetsu merged with a god-tree-empowered Madara from within, using the immense chakra absorbed from victims trapped in the Infinite Tsukuyomi to physically manifest Kaguya's body