Nature - Season 11 Episode 16: The Ghosts of Ruby

Episodes: 44

Specials

Unknown

Episodes: 13

Season 1

1982-10-10

Episodes: 13

Season 2

1983-10-09

Episodes: 18

Season 3

1984-09-30

Episodes: 20

Season 4

1985-10-20

Episodes: 20

Season 5

1986-10-19

Episodes: 21

Season 6

1987-09-20

Episodes: 20

Season 7

1988-10-09

Episodes: 20

Season 8

1989-10-08

Episodes: 21

Season 9

1990-09-30

Episodes: 21

Season 10

1991-09-28

Episodes: 18

Season 11

1992-10-05

Episodes: 14

Season 12

1993-10-03

Episodes: 15

Season 13

1994-10-02

Episodes: 14

Season 14

1995-10-08

Episodes: 14

Season 15

1996-10-13

Episodes: 16

Season 16

1997-10-12

Episodes: 16

Season 17

1998-10-11

Episodes: 18

Season 18

1999-10-24

Episodes: 16

Season 19

2000-10-22

Episodes: 17

Season 20

2001-09-09

Episodes: 14

Season 21

2002-10-13

Episodes: 13

Season 22

2003-10-19

Episodes: 13

Season 23

2004-11-07

Episodes: 13

Season 24

2005-11-06

Episodes: 16

Season 25

2006-10-24

Episodes: 13

Season 26

2007-10-28

Episodes: 13

Season 27

2008-10-26

Episodes: 10

Season 28

2009-10-25

Episodes: 16

Season 29

2010-09-26

Episodes: 13

Season 30

2011-10-19

Episodes: 13

Season 31

2012-10-10

Episodes: 19

Season 32

2013-09-04

Episodes: 17

Season 33

2014-09-24

Episodes: 16

Season 34

2015-09-23

Episodes: 17

Season 35

2016-10-12

Episodes: 16

Season 36

2017-10-04

Episodes: 15

Season 37

2018-10-24

Episodes: 18

Season 38

2019-10-02

Episodes: 13

Season 39

2020-10-21

Episodes: 13

Season 40

2021-10-20

Episodes: 13

Season 41

2022-10-19

Episodes: 17

Season 42

2023-10-18

Episodes: 13

Season 43

2024-10-23