Naruto Episode 7: The Assassin of the Mist!
Episode 7 of 220 of Naruto, aired November 14, 2002, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Team Kakashi and Tazuna are on their way to his home. On the way there they run across a ninja named, Zabuza Momochi. Is the Sharingan enough to defeat this new enemy, or is team Kakashi's first mission over before its even begun?