Quick recap
Black Zetsu betrays Madara and reveals who was behind it all: Kaguya Ōtsutsuki, mother of the Sage of Six Paths. Naruto, Sasuke, Sakura and Kakashi fight the goddess across different dimensions and manage to seal her with Obito's help. Then Sasuke reveals his plan: kill the Kage and rule alone. Naruto and Sasuke fight at the Valley of the End until each loses an arm. Sasuke admits defeat, and together they undo the Infinite Tsukuyomi. Sasuke leaves on a journey to redeem himself. In the epilogue, years later, Naruto is the Seventh Hokage, married with kids, and a new generation starts the Academy.
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