We see a flashback of the pair doing battle as students in the Academy during episode 257. The next time the two ninjas do battle is during Naruto Shippuden episode 215, which finishes up in episode 216. It’s also the longest battle in the original Naruto series and runs until episode 135. This clash influences the rest of the events in the series and ultimately leads to their next fight, which begins in episode 128, “ A Cry on Deaf Ears.” This is the iconic battle that takes place at the Valley of the End. The first time is on the hospital rooftop during episode 107, a fight that literally lasts for two episodes. In the original Naruto series, you can see these two shinobi clash twice.