What an interesting turn of events in the Series!!! First, it was shown the main antagonist, Tobi, is not who he was claiming to be. We all thought he was Madara Uchiha, but instead we found that Kabuto called back Madara Uchiha from the Deads using the Impure Blodd Resurrection Justu. Another interesting thing at that point was that Madara knew who this impostor is. Most of the people including myself thought, Tobi was Madara's brother, Izuna.
Then came Naruto 599, where it was finally revealed who Tobi actually is. It was none other than Obito Uchiha. Kakashi's former teammate, who gave Kakashi his left Sharingan eye as a gift for becoming a Jounin. Everyone thought he had died during that battle during the Third Shinobi war. It will be interesting to know how he survived and how he met Madara. As the series is reaches its climax there are going to be lot of explanations.
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