January 5, 2007
Episode 1 of Season 21 premiered on January 5, 2007
January 12, 2007
Episode 2 of Season 21 premiered on January 12, 2007
January 19, 2007
Episode 3 of Season 21 premiered on January 19, 2007
January 26, 2007
Episode 4 of Season 21 premiered on January 26, 2007
February 2, 2007
Episode 5 of Season 21 premiered on February 2, 2007
February 9, 2007
Episode 6 of Season 21 premiered on February 9, 2007
February 16, 2007
Episode 7 of Season 21 premiered on February 16, 2007
February 23, 2007
Episode 8 of Season 21 premiered on February 23, 2007
March 2, 2007
Episode 9 of Season 21 premiered on March 2, 2007
March 9, 2007
Episode 10 of Season 21 premiered on March 9, 2007
March 16, 2007
Episode 11 of Season 21 premiered on March 16, 2007
March 23, 2007
Episode 12 of Season 21 premiered on March 23, 2007
March 30, 2007
Episode 13 of Season 21 premiered on March 30, 2007
April 13, 2007
Episode 14 of Season 21 premiered on April 13, 2007
April 20, 2007
Episode 15 of Season 21 premiered on April 20, 2007
April 27, 2007
Episode 16 of Season 21 premiered on April 27, 2007
May 4, 2007
Episode 17 of Season 21 premiered on May 4, 2007
May 11, 2007
Episode 18 of Season 21 premiered on May 11, 2007
May 18, 2007
Episode 19 of Season 21 premiered on May 18, 2007
June 15, 2007
Episode 20 of Season 21 premiered on June 15, 2007
June 22, 2007
Episode 21 of Season 21 premiered on June 22, 2007
June 29, 2007
Episode 22 of Season 21 premiered on June 29, 2007
July 6, 2007
Episode 23 of Season 21 premiered on July 6, 2007
July 13, 2007
Episode 24 of Season 21 premiered on July 13, 2007
July 20, 2007
Episode 25 of Season 21 premiered on July 20, 2007
September 7, 2007
Episode 26 of Season 21 premiered on September 7, 2007
September 14, 2007
Episode 27 of Season 21 premiered on September 14, 2007
September 21, 2007
Episode 28 of Season 21 premiered on September 21, 2007
September 28, 2007
Episode 29 of Season 21 premiered on September 28, 2007
October 5, 2007
Episode 30 of Season 21 premiered on October 5, 2007
October 19, 2007
Episode 31 of Season 21 premiered on October 19, 2007
October 26, 2007
Episode 32 of Season 21 premiered on October 26, 2007
November 9, 2007
Episode 33 of Season 21 premiered on November 9, 2007
November 16, 2007
Episode 34 of Season 21 premiered on November 16, 2007
November 23, 2007
Episode 35 of Season 21 premiered on November 23, 2007
November 30, 2007
Episode 36 of Season 21 premiered on November 30, 2007
December 7, 2007
Episode 37 of Season 21 premiered on December 7, 2007
December 14, 2007
Episode 38 of Season 21 premiered on December 14, 2007
December 21, 2007
Episode 39 of Season 21 premiered on December 21, 2007