Avatar: The Last Airbender — S2 E6 - The Blind Bandit

In search for an earthbending teacher for Aang, the kids go to an underground earthbending tournament called Earth Rumble 6, where they encounter Toph, a blind but powerful earthbending girl. After seeing her unique style of earthbending, Aang wants Toph to become his teacher, but there are complications with Toph’s family.