The Legend of Korra Season 1

Book One: Air, sees Korra move from her secluded upbringing at the South Pole to Republic City to learn airbending from Tenzin, Avatar Aang's son. She enters the pro-bending league, and befriends the brothers Bolin and Mako, who she eventually falls in love with, as well as Asami Sato, heiress to Future Industries. The ambitious politician Tarrlok enlists Korra to fight the anti-bender uprising of the "Equalists", led by the masked Amon who strips benders of their abilities. Korra and her friends, aided by police chief Lin Beifong and United Forces general Iroh, manage to unmask and topple Amon, ending the military coup with which he seized Republic City.