Here is what the page “13 Years Ago, 'The Legend of Korra' Revealed the Avatar's True Origin and Burden” contains. In 2013, Nickelodeon's 'The Legend of Korra' aired a two-part episode titled 'Beginnings,' which finally explained the origins of the Avatar cycle. The story introduced Wan, the first Avatar, who lived 10,000 years before Korra's time. Wan was a firebender who learned to master all four elements after bonding with Raava, the spirit of light and peace. Their fusion created the Avatar spirit, destined to maintain balance between the human and spirit worlds.
This revelation gave the Avatar a clear purpose—but also a heavy burden. Every Avatar after Wan inherited not only immense power but also the responsibility to uphold harmony, often at great personal cost. The episode was a pivotal moment for the franchise, deepening the mythology and giving fans a long-awaited answer to the biggest mystery in the 'Avatar' universe. For the complete material, the listing points back to the source inside the network.