The Avatar Returns

This is episode 2 of Avatar: The Last Airbender

While exploring an abandoned Fire Nation warship, Aang realises he was in the iceburg for 100 years and accidently sets off a trap warning the Fire Nation someone is on their ship. Sokka fights the Fire Benders but fails, so Aang gives himself up to save the village. Sokka, Appa, and Katara all go and rescue Aang who frees himself from the Fire Benders. Aang awakens the Avatar spirit inside him to hold off the Fire Warriors and escape. They begin their journey to the North Pole so Aang can master the element after air, water.