4 - 1Danger Sep. 29, 2006
4 - 2Discoveries Oct. 06, 2006
4 - 3Dogs Oct. 13, 2006
4 - 4Dictionaries Oct. 20, 2006
4 - 5Death (Halloween Special) Oct. 27, 2006
4 - 6Drinks Nov. 03, 2006
4 - 7Differences Nov. 10, 2006
4 - 8Descendants (Children in Need Special) Nov. 17, 2006
4 - 9Doves Nov. 24, 2006
4 - 10Divination Dec. 01, 2006
4 - 11Deprivation Dec. 08, 2006
4 - 12Domesticity Dec. 15, 2006
4 - 13December (Christmas Special) Dec. 22, 2006