In which episodes did Naruto unlock the seal?

Naruto unlocked the Nine-Tails seal in episodes 548-549.

Related plot introduction of Naruto unlocking the seal of the Nine-Tails:

Chapter 548 Nine Lamas

Naruto, who was swallowed by the Four-Tails, is in the spiritual world with The Four Tails met face to face and made an agreement to unlock the chain seal, but after hearing the Four Tails' words that "they don't believe in the Jinchūriki", the Nine Tails recalled the past when they were forcibly sealed into Naruto's body.

As well as the past that was filled with hateful thoughts in his heart, but it was also the memory of Kyuubi and Naruto spending time together. The days Naruto had spent so far and the thoughts and actions of the battle were all forgotten by Kyuubi. Wei sees it.

Chapter 549: The Duo

Naruto beautifully unlocked the seal of the chain and gained the trust of the four-tailed Sun, but the seal still could not be completely unlocked, and Sun was The outsider golem was sucked in, and the masked man further transformed all the remaining Jinchūriki into tailed beasts and launched an attack.

Naruto was also unable to move due to exhaustion of chakra. Just when he was helpless, Kyuubi spoke to Naruto. The Kyuubi Lama, who was moved by Naruto's actions, expressed his intention to lend his power to Naruto. Naruto, the combination of Naruto and Nine Lamas of Konoha Ninja Village finally took action.

Extended information:

Related character introduction:

Uzumaki Naruto

The fourth generation of ninjas from the hidden village of Konoha in the Land of Fire The son of Naruto Namikaze Minato and Uzumaki Kushina, the reincarnation of Asura, the second son of the Sage of Six Paths. When he was born, his parents sacrificed their lives to protect the village and sealed the tailed beast "Nine Tails" inside Naruto.

In order to realize his dream and protect the bonds of his partners, Naruto continued to practice and become stronger. As a disciple of Jiraiya, one of the "Three Ninjas" of Konoha, he continued to break through himself in the process of pursuing his dream. He implemented his own way of tolerance and gained people's recognition.

In the end, he ended the war with the Ninja Alliance, Uchiha Sasuke and Nine-Tails, brought peace to the conflicting ninja world, and realized his dream of becoming Hokage (Seventh Generation Hokage) and a hero of the ninja world. .

Nine-Tailed Nine Lamas

A giant tailed beast with nine tails. In ancient times, the nine parts of chakra were separated from the body of the ten tails by the Sage of Six Paths. After the nine parts of chakra were separated, the nine tailed beasts were formed. Among them, the nine tails have the most chakra and are the strongest.

It was sealed in Uzumaki Mito, Uzumaki Kushina and Uzumaki Naruto, and finally reconciled with Uzumaki Naruto, making Naruto a perfect jinchuriki. After Uchiha Madara was resurrected, the Nine-Tails positive chakra was absorbed by the heretic demon and sealed in Uchiha Madara's body. The Nine-tails negative chakra was put into Naruto by Uchiha Obito, saving Naruto's life.

Baidu Encyclopedia-Naruto Shippuden