The Number One Hyperactive, Knucklehead Ninja Joins the Fight! (意外性Ｎｏ．１、ナルト参戦！, Igaisei Nanbā Wan, Naruto Sansei!) is episode 14 of the original Naruto anime.
Naruto finally joins the battle on the bridge and sees that Sasuke is having a hard time fighting Haku. Kakashi is unable to help them, as he is dealing with Zabuza while protecting Sakura and Tazuna. Although he is helpless, he orders Naruto and Sasuke to attack the mirrors from the outside and the inside at the same time. Sasuke thinks this idea is considering and decides to tell Naruto. But before Sasuke could say anything to Naruto, he stupidly enters right into the cage of ice mirrors. Sasuke tells Naruto that he is a complete loser and that now they are both trapped. After a little arguing, both agree to work together. 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 his side no matter how terrible he is.