An unconscious stranger found in the middle of the Earth Kingdom was surprisingly saved by the exiled-Prince-cum-fugitive of the Fire Nation. Unaware to the Prince, this stranger's appearance could bring seismic changes to everyone's belief and destiny, particularly that of a certain legendary figure - the Avatar.
Percy has been sent to the universe of Avatar at the request of Raava. His quest was to protect and assist the reincarnations of The Avatar at any cost.