All Available Season All Season Specials Mar, 1973 7 episodes 0.0 Season 1 Jan, 1974 13 episodes 6.5 Season 2 Sep, 1974 22 episodes 8.8 Season 3 Sep, 1975 21 episodes 9.7 Season 4 Sep, 1976 22 episodes 8.0 Season 5 Sep, 1977 21 episodes 0.0
