All Available Season All Season Specials Apr, 2010 17 episodes 0.0 Season 1 Sep, 1970 24 episodes 7.7 Season 2 Sep, 1971 24 episodes 0.0 Season 3 Sep, 1972 24 episodes 0.0 Season 4 Sep, 1973 24 episodes 0.0 Season 5 Sep, 1974 24 episodes 0.0 Season 6 Sep, 1975 24 episodes 0.0 Season 7 Sep, 1976 24 episodes 0.0
