Sasuke's Decision: Pushed to the Edge!

is episode 75 episode of the original Naruto anime.

Synopsis
Gaara begins transforming into Shukaku, dramatically increasing his strength and speed, and the difficulty faced by Sasuke fighting him. Sasuke uses his Chidori to slice Gaara's arm off, but at this pain Gaara only becomes more determined and excited to kill Sasuke. Unable to use the Chidori on his own anymore, Sasuke is forced to use his cursed seal so that he can attack Gaara with another Chidori. Again this fails to stop Gaara, and Sasuke collapses due to the use of the cursed seal. As Gaara prepares to kill Sasuke, Naruto and Sakura finally arrive, repelling Gaara.