Haku no hijutsu: Makyô hyôshô Naruto : Season 5 Episode 13

Once again, the time has come to fight Zabuza, and this time he's got company -- the tracking ninja who supposedly killed him. Zabuza and his companion take notice of Sasuke's abilities, and Sasuke in turn realizes the immense power that the masked ninja holds. As if they were meant to fight each other, Sasuke and the masked ninja begin to battle.