Complete story — includes the ending
The group arrives at the Earth Kingdom city of Omashu. There, Aang shows Katara and Sokka the Omashu mail delivery system, a massive network of stone causeways which he and his friend Bumi had once ridden for fun a hundred years previous. The trio gives the chutes a try but runs into trouble after they destroy a cabbage merchant's cart. Brought before the king of the city, an elderly neurotic man, the three are given a feast, during which the king outs Aang as being the Avatar and imprisons them and puts Aang through three deadly challenges the next day to test his skills and earn Katara and Sokka's freedom, culminating in a duel with the king himself. After Aang passes all of the challenges, the king forces Aang to guess his name. Aang ponders the question, finally deducing the king is his old friend Bumi. Bumi and Aang finally reunite, and Katara and Sokka are set free.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Avatar: The Last Airbender season 1. HTML formatting and reference markers removed. · Content license