January 19, 1970
Episode 1 of Season 4 premiered on January 19, 1970
February 16, 1970
Episode 2 of Season 4 premiered on February 16, 1970
March 16, 1970
Episode 3 of Season 4 premiered on March 16, 1970
April 13, 1970
Episode 4 of Season 4 premiered on April 13, 1970
May 11, 1970
Episode 5 of Season 4 premiered on May 11, 1970
June 8, 1970
Episode 6 of Season 4 premiered on June 8, 1970
July 6, 1970
Episode 7 of Season 4 premiered on July 6, 1970
August 3, 1970
Episode 8 of Season 4 premiered on August 3, 1970
August 31, 1970
Episode 9 of Season 4 premiered on August 31, 1970
September 28, 1970
Episode 10 of Season 4 premiered on September 28, 1970
October 26, 1970
Episode 11 of Season 4 premiered on October 26, 1970
November 23, 1970
Episode 12 of Season 4 premiered on November 23, 1970
December 21, 1970
Episode 13 of Season 4 premiered on December 21, 1970