Avatar, the Last Airbender 2

Although Aang denies to Katara that he is the Avatar, she soon learns the truth when a young Firebender prince named Zuko attacks her village in search of the Airbender, but with the help of Katara, Sokka, and his flying bison Appa, Aang escapes Zuko's clutches and takes the first step to becoming the Avatar. Media tie-in. All ages.