Naruto Episode 68: Zero Hour! The Destruction of the Hidden Leaf Village Begins!
Episode 68 of 220 of Naruto, aired January 28, 2004, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Sasuke's match is interrupted when Orochimaru puts his plan into action. Temari and Kankuro are ordered to get Gaara to safety until he recovers, leaving Sasuke to chase after them. War has begun!