Naruto Episode 132: Close Friend!
Episode 132 of 220 of Naruto, aired April 27, 2005, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Kakashi learns the truth about the chase after Sasuke, and orders his dogs, including Pakkun, to go find Naruto and Sasuke. However, things are looking grim as the clash between the Chindori and the Rasengan ensues. The attacks are even, causing Naruto and Sasuke to both fly back. Naruto finally realizes how serious Sasuke is, and gets the snot beat out of him while he remembers how he always wanted to be friends with Sasuke.