Aang learns of his people's genocide at the hands of the Fire Nation his anger triggers his Avatar State, which in turn alerts the world that the Avatar has returned. While journeying to the North Pole, Aang, Sokka, and Katara explore Aang's former home, the Southern Air Temple. After realizing that he is the long lost Avatar, they agree to accompany him on his travels to master the other elements. Katara and Sokka fly in on Appa to save Aang from the Fire Nation. Prince Zuko attacks the Southern Water Tribe seeking to capture the Avatar, Aang. Meanwhile, his unfreezing attracts the attention of the Fire Nation's Zuko intent on capturing him. After Katara frees him, she discovers that he is an airbender and the siblings take him to their home village in the Southern Water Tribe. Sokka and Katara, two teenage siblings living in the South Pole, discover Aang and his pet flying bison, Appa, trapped in an iceberg. However, they must evade a critical foe, Prince Zuko of the Fire Nation, who wants to capture Aang. Sokka and his sister Kya (later renamed Katara), must travel the world to find masters for Aang, who is the Avatar. " Unaired pilot" (not part of continuity) The original pilot episode never aired but can be seen on the sixth disc of The Complete Book 1 Collection. The final two chapters comprise the season finale.
The first two chapters comprise the series premiere. She, like many others in the Earth Kingdom, had a strong hatred for the Fire Nation.Episodes Book One: Water Main article: Book One: Water As a mother, Sela was protective of her children, and though she appeared to be a strong woman, she was not above asking for help when she was in over her head. She was respectful and willing to welcome strangers into her home if she believed them to be decent. Sela was a kind woman but clearly stressed with the burdens of her family and running a farm. Zuko offered the dagger to Lee again, but after he said that he hated the banished prince, Sela and her youngest son left. Upon discovering who Zuko really was, Sela did not want him around her family anymore and protectively stood in front of Lee. Zuko engaged and defeated Gow and his men in battle, but not without revealing his true identity as the heir to the throne of the Fire Nation. Lee had foolishly pulled a knife on them, subsequently prompting Gow to take him with them, remarking that "if Lee old enough to fight, he old enough to join the army". After Zuko had left, she went out to find him and begged for his help, as Gow had returned to the farm as soon as Gansu had left. Gansu said his goodbyes to his family and departed in search of his eldest son, leaving Sela to care for Lee. The man smirked as he told Sela that her son was either dead or going to be dressed up in a Fire Nation uniform and put on the front line unarmed. Sela was heartbroken when Gow and the rest of his men rode up to the farm and informed the family that Sensu's battalion had been captured. Sela was worried about her son after Gow took him captive and threatened to enlist the child in the army.
As Zuko left the farm, Sela offered him some food that "ought to get through a few meals". Sensing that Zuko's refusal to stay had more to do with honor than the lack of hunger, she suggested that Gansu could use some help on the barn, providing Zuko with a means to repay the family for their hospitality. She subsequently invited the apparent traveler to join her family for supper. When Sela kindly inquired what Zuko's name was, he hesitated her husband, Gansu, said that Zuko did not need to tell them his name if he would rather not. In 100 AG, Zuko came to the village and helped Lee out of a tough situation in return, he was invited back to stay at the farm. Sela had a strong dislike for Gow and his men, as they were simply antagonistic hectors who did not actively contribute to their country in the Hundred Year War, while her eldest son, Sensu, had gone to the front lines. The family made their home in a plains village, that Gow and other soldiers were in charge of. After Sela met and married Gansu, the couple had two children together: Sensu and Lee.