January 23, 1968
Episode 1 of Season 12 premiered on January 23, 1968
February 20, 1968
Episode 2 of Season 12 premiered on February 20, 1968
March 19, 1968
Episode 3 of Season 12 premiered on March 19, 1968
April 23, 1968
Episode 4 of Season 12 premiered on April 23, 1968
May 21, 1968
Episode 5 of Season 12 premiered on May 21, 1968
June 25, 1968
Episode 6 of Season 12 premiered on June 25, 1968
July 23, 1968
Episode 7 of Season 12 premiered on July 23, 1968
August 20, 1968
Episode 8 of Season 12 premiered on August 20, 1968
September 24, 1968
Episode 9 of Season 12 premiered on September 24, 1968
October 29, 1968
Episode 10 of Season 12 premiered on October 29, 1968
November 26, 1968
Episode 11 of Season 12 premiered on November 26, 1968
December 17, 1968
Episode 12 of Season 12 premiered on December 17, 1968