"Light vs. Dark: The Two Faces of Gaara" (光と闇 我愛羅という名, Hikari to Yami Gaara to Iu na) is episode 77 of the original Naruto anime.
As Gaara continues to reminisce about Yashamaru, he remembers Yashamaru's defeat and attempted suicide bombing. Although he was able to survive the blast, Gaara lost the only person who ever cared for him. From that point on, Gaara came to love, and care about only himself and starting living off of killing others. Returning to the present day, Gaara quickly restrains Sakura with a claw made of sand and slowly squeezes her. Determined to save Sasuke and Sakura at all costs, Naruto takes Gaara on.