Between 4 January 2006 and 19 September 2006, five DVD sets were released in the USA, each had four episodes from the season. On 12 September 2006, Nickelodeon also released the "Complete Book One Collection Box Set", which had all of the episodes in the season as well as a special features disc. The original releases were encoded in Region 1 (USA), a DVD type that plays only in American DVD players. From 2007 to 2009, Nickelodeon released Region 2 DVDs (Europe), which can play in Europe.