November 18, 1977
Episode 49 of Season 4 premiered on November 18, 1977
January 5, 1978
Episode 89 of Season 4 premiered on January 5, 1978
May 25, 1978
Episode 170 of Season 4 premiered on May 25, 1978
September 18, 1978
Episode 220 of Season 4 premiered on September 18, 1978