Original: Between January 23, 2007 and September 11, 2007, Nickelodeon released five DVD sets for the season: four sets containing five episodes each, and a fifth DVD collection of all twenty episodes.
Simplified: Between 23 January 2007 and 11 September 2007, Nickelodeon released five DVD sets for the season: four sets had five episodes each, and a fifth DVD collection of all twenty episodes.