Winter Solstice, Part 1: The Spirit World

This is episode 7 of Avatar: The Last Airbender.

The party arrives at a Earth Kingdom forest, and sees what looks like a huge black scar in the middle of the woods. They land only to find out that it was burned down by Fire Nation soldiers. Aang feels bad that he let that happen, but Katara assures him that the forest will grow back, because of all the acorns around. The party is startled when an old man comes asking the avatar (Aang) for his help. The group arrives at a village in ruins and learns that it was being terrorized by the forest's spirit, Havi. They ask Aang to help them, he doesn't know how, but he agrees. At sunset, he went out to confront the spirit. Aang was trying to talk to the spirit, but it seemed it wasn't listening. Sokka runs out to help Aang, but is captured and taken away by the spirit instead. Aang, while chasing after Sokka and the spirit, mysteriously enters the spirit world. He is confronted by a dragon, which turns out to be Avatar Roku's dragon. The dragon takes Aang to a temple on a cresent shaped island to see Avatar Roku's statue. Aang finds out that Avatar Roku wants to speak to him about a comet, and the only time they can talk is during the Winter Solstice. The dragon takes Aang back to his body and there, Aang learns why the spirit is terrorizing the village. The spirit was upset and angry that his home was being burned down. At sunset, Aang shows the spirit that the forest will grow back by giving him an acorn. The satisfied spirit (which turned into a panda bear) leaves the village, and in its trail, it left a few bamboo stalks that the captured villagers (including Sokka) come out of. The show ends with Aang telling Katara and Sokka that he needed to go to the temple (which is in the Fire Nation) to speak with Avatar Roku by sunset on the Solstice (which was the next day).