Last updated on Monday 20 January 2014 at 22:36 UK

Watch Avatar - Series 1 - Episode 20 Online Free

Avatar - Series 1 - Episode 20PLAY

Zhao’s invasion breaks through the outer wall of the Northern Water Tribe’s defenses, and he reveals a sinister plan. Aang goes to the spirit world for help – but will he return in time to stop Zhao and prevent the destruction of the Water Tribe?

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