Naruto (2002)

S1E49 Lee's Hidden Strength: Forbidden Secret Jutsu!

As the fight rages on between Lee and Gaara, Gai reflects on Lee's relentless training and his lack of ninjutsu or genjutsu abilities. Much like Naruto, Lee is a dropout. To stand a chance against Gaara, Lee must resort to a technique that Gai had strictly prohibited him from using.