All Available Season All Season Season 1 Jan, 1972 14 episodes 6.6 Season 2 Sep, 1972 24 episodes 8.0 Season 3 Sep, 1973 24 episodes 9.0 Season 4 Sep, 1974 25 episodes 2.3 Season 5 Sep, 1975 24 episodes 2.8 Season 6 Sep, 1976 25 episodes 0.7
