Quick recap
Filler arc. Mizuki, the teacher who tricked Naruto in the very first episode, breaks out of prison and plans to free other criminals. He wounds Asuma and Kurenai and drinks a potion that gives him monstrous strength. Naruto and Team 10 take on Fujin and Raijin, a pair of hulking brothers, until Tsunade shows up and flattens them. Iruka confronts his old classmate, and their history shows Mizuki's envy and cruelty going back to the Academy. Naruto beats him with a Rasengan, and Mizuki loses the ability to use ninja techniques. Iruka buys everyone ramen.
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