Itachi Uchiha is the most mysterious character in Naruto. For most of the series, he's hidden in his Akatsuki robes and nobody knows his true intentions, including his fellow Akatsuki members.

Midway through their destination, a member of Akatsuki appears to hold them off. He is none other than Itachi Uchiha. Kakashi immediately jumps to challenge Itachi in a battle of taijutsu.