March 27, 1968
Episode 1 of Season 12 premiered on March 27, 1968
May 15, 1968
Episode 2 of Season 12 premiered on May 15, 1968
July 10, 1968
Episode 3 of Season 12 premiered on July 10, 1968
September 13, 1968
Episode 4 of Season 12 premiered on September 13, 1968
November 29, 1968
Episode 5 of Season 12 premiered on November 29, 1968