Kakashi destroys Deidara's arm with Mangekyo Sharingan: Kamui. After Naruto beheads the clay bird with his Rasengan, he sees the dead and lifeless body of Gaara. This causes Naruto to angrily attack Deidara and accidentally uses his Nine-Tails chakra, causing him to transform into the beast with two tails. (Source: Wikipedia) Kazekage Rescue Mission arc: (29/32)

Aired on: 9/26/2007