April 27, 1968
Episode 1 of Season 4 premiered on April 27, 1968
May 4, 1968
Episode 2 of Season 4 premiered on May 4, 1968
May 11, 1968
Episode 3 of Season 4 premiered on May 11, 1968
May 18, 1968
Episode 4 of Season 4 premiered on May 18, 1968
May 25, 1968
Episode 5 of Season 4 premiered on May 25, 1968
June 8, 1968
Episode 6 of Season 4 premiered on June 8, 1968
July 3, 1968
Episode 7 of Season 4 premiered on July 3, 1968
July 17, 1968
Episode 8 of Season 4 premiered on July 17, 1968
July 31, 1968
Episode 9 of Season 4 premiered on July 31, 1968
August 14, 1968
Episode 10 of Season 4 premiered on August 14, 1968
August 28, 1968
Episode 11 of Season 4 premiered on August 28, 1968
September 4, 1968
Episode 12 of Season 4 premiered on September 4, 1968
September 11, 1968
Episode 13 of Season 4 premiered on September 11, 1968