Book 2: Earth, Vol. 2 The five chapters in Avatar the Last Airbender: Book 2 Earth, Volume 2 continue the story of young avatar Aang's adventures deep within the Earth Kingdom. As usual, each episode is a seamless blend of grave drama and comic relief, but the stakes seem higher than ever with the addition of a new member to Aang's team. Joining Katara and Sokka is Toph, a blind but powerful earthbending girl trying to obscure her aristocratic origins by defeating large, scary men in the ring. Aang recognizes Toph from his vision of an earthbending teacher, whom he needs to help him master control over the earth element. Toph also adds a kind of sardonic, tart tone to Aang's journey, ultimately leaving her world to join the series' trio of young heroes. "The Blind Bandit" finds Aang, Katara, and Sokka working hard at convincing Toph to help their mission. "Zuko Alone" carries on the tale of the firebending prince who now travels alone and anonymously, but comes close to befriending a boy in an Earth Kingdom town. (The episode is full of interesting flashbacks from Zuko's youth.) "The Chase" also concerns Zuko's past, but is primarily about Aang, Katara, and Sokka adjusting to Toph's somewhat self-centered presence on the team at the same time Princess Azula is relentlessly hunting them all down in a kind of speeding tank. "Bitter Work" finds Toph having difficulties training Aang, while "The Library" is an exotic episode about a professor who leads the crew to a library containing information useful against the Fire Nation. When they get there, they find the place guarded by the owl-like Wan Shi Tong, who begins sinking the library in defense against the perceived invaders. --Tom Keogh

Book 2: Earth, Vol. 3 Avatar the Last Airbender: Book 2 Earth, Volume 3 covers chapters 11 through 15 in the ongoing saga of Aang, the 12-year-old reincarnation of an avatar destined to reunite the warring nations of fire, earth, water, and air. Still traveling with his friends Katara, Sokka, and newcomer Toph, Aang gets into some of the strangest and most compelling situations yet seen on his journey to master control over all four elements. The first story, "The Desert," finds Aang so upset over the abduction and criminal sale of his flying bison, Appa, that the powerful boy shows a streak of rage, demonstrating to himself that he could easily use his emerging skills to harm enemies if he wished. Still, Appa remains missing through this volume, leading the gang on a mission to survive a desert sojourn and survive during a perilous flight (with a young family in tow) over a pass through mountains and ocean in "The Serpent's Pass." They also get involved in a bizarre fight (in "The Drill") against the Fire Nation army and its gigantic drill, which is aimed at the outer wall of Ba Sing Se, a city occupied by earth people. Once inside Ba Sing Se, however, things get really weird: smiling officials (in "City of Walls and Secrets") outlaw any discussion of the war outside in order to keep the population placid and the economy rolling. Finally, "Tales of Ba Sing Se" is an original piece made up of individual vignettes focusing on each of the major characters. If there is anything surprising about Book 2 Earth, Volume 3, it's the amount of romance (kissing, even!) in the air. These Avatar boys and girls are growing up. --Tom Keogh

Book 2: Earth, Vol. 4 The long journey of young Avatar Aang and his friends Katara, Sokka, and Toph continues in this dramatic installment in the Avatar the Last Airbender series. Picking up from Volume 3, the first chapter on this disc, "Appa's Lost Days," traces the hard times of Aang's winged bison, Appa, after the latter is stolen in order to blackmail Aang into not going to the Earth King with information about a pending coup. The clever Aang manages to find Appa anyway and complete his crucial mission, though he learns, in "The Earth King," that the sheltered monarch doesn't buy the notion that his own counsel, the power-grasping Long Feng, could be behind such a conspiracy. Complicating matters is the arrival of Princess Azula to take control over forces loyal to Long Feng, while Zuko, the reformed Fire Nation prince now acting as a humble but happier servant to his wise, tea-drinking uncle, is powerless to stop her. (On the other hand, Zuko forms an unexpected bond with one of Aang's allies.) Everything comes to a head in "The Crossroads of Destiny," in which Aang, suddenly confused by the sage advice of a guru who tells him he must free himself of a crucial emotional attachment, joins the others in an uphill effort to stop Azula from overtaking the Earth King. As engaging and frequently funny as every other volume in the Avatar series, Volume Four is a great ride through a climactic time in the long-running story. --Tom Keogh