This episode is part of the long stretch of filler that occurred after the Sasuke Recovery Mission. While not canon to the manga, it provides significant closure to the very first conflict of the series (Naruto vs. Mizuki in Episode 1).
Confronts his past and his former friend. This episode highlights Iruka's role not just as a teacher, but as the first person to truly acknowledge Naruto. Naruto (Dub) Episode 147
English Title: "A Clash of Fates: You Can't Bring Me Down" Arc: Mizuki Tracking Mission (Filler) Original Air Date (Dub): January 5, 2008 I. Summary of Events This episode is part of the long stretch
The episode concludes the battle between Naruto, Iruka, and the traitor Mizuki. Having consumed a special serum provided by Orochimaru, Mizuki transforms into a monstrous, tiger-like beast with immense strength. However, the serum has a fatal flaw: it burns through the user's life force and physical stamina at an unsustainable rate. Confronts his past and his former friend
You can watch the English dubbed version of Naruto on platforms like Hulu and Netflix (availability varies by region).