All Available Season All Season Season 1 Feb, 1973 34 episodes 10.0 Season 2 Jan, 1974 35 episodes 0.0 Season 3 Jan, 1975 36 episodes 0.0 Season 4 Jan, 1976 40 episodes 0.0 Season 5 Feb, 1977 42 episodes 0.0 Season 6 Mar, 1978 39 episodes 0.0 Season 7 Jan, 1979 49 episodes 0.0