In the first half of the two-part season finale, Zhao begins to launch his attack against the Northern Water Tribe. As the walls of the prestiged city begin to fall, the Avatar taps into the spirit world and seeks the help of one of the oldest spirits, in hopes of saving one of the most prominent areas of the world.

Aang returns from the spirit world to a big surprise. Meanwhile, Zhao and his forces continue to press deeper into the Northern Water Tribe. What could possibly stop the fire nation from destroying this tranquil region? If Zhao has his way, nothing. Also, Iroh makes a powerful stand and Zuko struggles to keep his plan intact.

Stephen Fry and Alan Davies are joined by Clive Anderson, Jo Brand and Phill Jupitus to discuss some Quite Interesting topics beginning with the letter C.