February 4, 1971
Episode 1 of Season 4 premiered on February 4, 1971
April 22, 1971
Episode 2 of Season 4 premiered on April 22, 1971
September 30, 1971
Episode 3 of Season 4 premiered on September 30, 1971
November 18, 1971 • 45m
Episode 4 of Season 4 premiered on November 18, 1971