Naruto: Shippūden (2007)

S15E344 Obito and Madara

It turns out that the masked figure is none other than Obito, Kakashi’s long-lost friend who was thought to have perished during the battle at Kannabi Bridge. The revelation leaves Naruto and the rest of the team stunned, especially when they discover that Obito has been collaborating with the infamous Madara Uchiha all along.