March 30, 1973
Episode 1 of Season 21 premiered on March 30, 1973
April 6, 1973
Episode 2 of Season 21 premiered on April 6, 1973
April 13, 1973
Episode 3 of Season 21 premiered on April 13, 1973
April 27, 1973
Episode 4 of Season 21 premiered on April 27, 1973
May 4, 1973
Episode 5 of Season 21 premiered on May 4, 1973
May 11, 1973
Episode 6 of Season 21 premiered on May 11, 1973
July 20, 1973
Episode 7 of Season 21 premiered on July 20, 1973
December 26, 1973
Episode 8 of Season 21 premiered on December 26, 1973