January 25, 1970
Episode 1 of Season 4 premiered on January 25, 1970
April 8, 1970
Episode 2 of Season 4 premiered on April 8, 1970
May 18, 1970
Episode 3 of Season 4 premiered on May 18, 1970
June 7, 1970
Episode 4 of Season 4 premiered on June 7, 1970
June 12, 1970
Episode 5 of Season 4 premiered on June 12, 1970
July 12, 1970
Episode 6 of Season 4 premiered on July 12, 1970
August 14, 1970
Episode 7 of Season 4 premiered on August 14, 1970
September 18, 1970
Episode 8 of Season 4 premiered on September 18, 1970
October 14, 1970
Episode 9 of Season 4 premiered on October 14, 1970
December 17, 1970
Episode 10 of Season 4 premiered on December 17, 1970