Intros
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    1977
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      1976
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        1975
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          1974
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            1973
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            Season 5 Intro
              1972
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              Season 6 Intro
                1971
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                Season 1
                  1970
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                  Season 2
                    1969
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                    Season 3
                      1968
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                      Season 4 (Seth Green in credits)
                        1967
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                        Season 4 (James Marsters replaces Seth Green in credits)
                          1966
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                          Season 4 (Marc Blucas added to credits)