Akamaru Trembles: Gaara's Cruel Strength! (赤丸ビックリ!我愛羅、驚異の実力, Akamaru Bikkuri! Gaara, Kyōi no Jitsuryoku) is episode 34 of the original Naruto anime.
As Team 7, Team 10, and Team Guy recover, Team 8 witnesses Gaara mercilessly kill a team of Amegakuregenin. Although Gaara prepares to turn his attention to Team 8, his siblings persuade him to leave them alone. Gaara's team shatters the record for reaching the tower, reaching their destination in about an hour and a half, and Gaara does not have so much as a speck of dirt on his clothes.
In the English dub, Anko says that Gaara is brunette (brown haired), as he is in the manga, but he is really a red head in the anime. This might have been a script malfunction from the manga to anime.