January 3, 1972
Episode 1 of Season 4 premiered on January 3, 1972
February 28, 1972
Episode 2 of Season 4 premiered on February 28, 1972
March 27, 1972
Episode 3 of Season 4 premiered on March 27, 1972
April 17, 1972
Episode 4 of Season 4 premiered on April 17, 1972
May 8, 1972
Episode 5 of Season 4 premiered on May 8, 1972
June 12, 1972
Episode 6 of Season 4 premiered on June 12, 1972
July 17, 1972
Episode 7 of Season 4 premiered on July 17, 1972
September 18, 1972
Episode 8 of Season 4 premiered on September 18, 1972
October 9, 1972
Episode 9 of Season 4 premiered on October 9, 1972
November 13, 1972
Episode 10 of Season 4 premiered on November 13, 1972
December 18, 1972
Episode 11 of Season 4 premiered on December 18, 1972