September 13, 1972
Episode 1 of Season 4 premiered on September 13, 1972
September 20, 1972
Episode 2 of Season 4 premiered on September 20, 1972
September 27, 1972
Episode 3 of Season 4 premiered on September 27, 1972
October 4, 1972
Episode 4 of Season 4 premiered on October 4, 1972
October 11, 1972
Episode 5 of Season 4 premiered on October 11, 1972
October 18, 1972
Episode 6 of Season 4 premiered on October 18, 1972
October 25, 1972
Episode 7 of Season 4 premiered on October 25, 1972
November 1, 1972
Episode 8 of Season 4 premiered on November 1, 1972
November 8, 1972
Episode 9 of Season 4 premiered on November 8, 1972
November 15, 1972
Episode 10 of Season 4 premiered on November 15, 1972
November 22, 1972
Episode 11 of Season 4 premiered on November 22, 1972
November 29, 1972
Episode 12 of Season 4 premiered on November 29, 1972
December 6, 1972
Episode 13 of Season 4 premiered on December 6, 1972
December 13, 1972
Episode 14 of Season 4 premiered on December 13, 1972
December 20, 1972
Episode 15 of Season 4 premiered on December 20, 1972
January 3, 1973
Episode 16 of Season 4 premiered on January 3, 1973
January 10, 1973
Episode 17 of Season 4 premiered on January 10, 1973
January 17, 1973
Episode 18 of Season 4 premiered on January 17, 1973
January 24, 1973
Episode 19 of Season 4 premiered on January 24, 1973
January 31, 1973
Episode 20 of Season 4 premiered on January 31, 1973