"This is the End!!" (終わりだ!!, Owari da!!, Viz: Game Over!!!) 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 "Kakashi of the Sharingan", Zabuza coats the area in a thick mist so that he can attempt to kill Tazuna without anyone noticing. As Zabuza appears within Team 7's 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.