Naruto Season 1 Episode 27

The second exam is about to begin, and every ninja must sign a form so that their team can get either the Heaven or Earth Scroll. The goal is to get one of each scroll and make it to the tower in five days. The groups get their scrolls and the exam begins. Naruto is ambushed by a ninja who poses as him. This ninja doesn’t fool Sasuke, who immediately figures it out. Meanwhile, a new foe seeks them out, but who is this foe?