"Avatar: The Last Airbender" is an animated television series created by Michael Dante DiMartino and Bryan Konietzko. The show aired from 2005 to 2008 and consists of three seasons. Each season is referred to as a "Book," and they are titled "Water," "Earth," and "Fire."

In Season 2, titled "Book Two: Earth," Aang and his friends continue their journey to master the four elements and defeat the Fire Nation. Here are some key plot points and episodes from Season 2:

  1. Episode 1-2: "The Avatar State" / "The Cave of Two Lovers" Aang learns about the Avatar State and begins his earthbending training. The group encounters a secret tunnel that leads them to a dangerous maze.

  2. Episode 5-6: "Avatar Day" / "The Blind Bandit" Aang and his friends encounter a town that celebrates "Avatar Day," which commemorates the day Kyoshi killed Chin the Conqueror. Aang also meets Toph Beifong, a skilled earthbender who becomes the group's new earthbending teacher.

  3. Episode 11-12: "The Desert" / "The Serpent's Pass" Aang and his friends struggle with the loss of Appa, who was captured by sandbenders. They cross the treacherous Serpent's Pass, facing challenges along the way.

  4. Episode 13-14: "The Drill" / "City of Walls and Secrets" The group tries to stop the Fire Nation from breaching the walls of Ba Sing Se using a massive drilling machine. They also explore the secrets and divisions within the city.

  5. Episode 19-20: "The Guru" / "The Crossroads of Destiny" Aang seeks guidance from a spiritual guru to master the Avatar State. However, the group faces a betrayal in Ba Sing Se that puts the world in grave danger.