The Blue Spirit

After Sokka and Katara get sick from the storm of the previous episode Aang seeks out a cure and discovers he needs some frozen frogs in order to get them cured. Meanwhile, Zhao has been promoted to Admiral and he is using the Fire Nation's best men to capture Aang, which turns out to be bad news as Aang is captured while trying to get the frogs to cure his friends. All hope seems lost for Aang and his friends, but there may just be a glimmer of hope when a strange blue spirit masked figure comes to Aang's rescue, but who could it possibly be?