The Number One Hyperactive, Knucklehead Ninja Joins the Fight!

is episode 14 of the original Naruto anime.

Synopsis
Naruto finally joins the battle on the bridge. But when Naruto stupidly gets caught in the middle of Haku's jutsu with Sasuke, they must work together to escape. Kakashi is unable to help them as he must deal with Zabuza while protecting Sakura and Tazuna. Haku reveals that he doesn't like to kill his enemies but would do so if he must. Regardless of Zabuza's ill-manner, Haku is dead-set on staying by side no matter how terrible he is.