This is the End!! (終わりだ!!, Owari da!!) is chapter 12 of the original Naruto manga.
Knowing that Zabuza will be a tough opponent, Kakashi uncovers his Sharingan eye. Intending to defeat the famous "Sharingan Kakashi", Zabuza coats the area in a thick mist so that he can try and kill Tazuna without anyone noticing. As Zabuza appears within Team 7 ranks and prepares to strike Tazuna, Kakashi stops him. This Zabuza turns out to be a water clone, and another Zabuza quickly attacks Kakashi. This Kakashi is also a water clone, having used his Sharingan to copy Zabuza's technique.