When Sokka and Katara fall ill, Aang goes in search of an herbalist institute in order to find a cure. There, he finds an eccentric old herbalist who tells him that his friends need to suck on frozen frogs that can be found in the nearby swamp. But on the way to the swamp, a group of highly skilled Yuyan archers ambush Aang and capture him. The archers bring Aang to a heavily fortified Fire Nation stronghold where he faces the newly promoted Admiral Zhao and learns of his fate -- the Fire Nation will imprison the young Avatar for the rest of his life, keeping him just barely alive so that he cannot reincarnate. Just as all hope seems lost, a mysterious warrior, wearing a blue spirit mask, infiltrates the stronghold and cuts Aang free from his chains. Together, the Blue Spirit and Aang make an incredibly daring escape, fighting past hundreds of Fire Nation soldiers and over the stronghold’s three walls. Who is the Blue Spirit? What are his true intentions? And will Aang make it back in time to give his friends their cure?