Aang, Katara, Sokka and Toph finally reunite with Appa.

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.