Season
- Season 0 1999-07-13
- Season 1 1974-03-03
- Season 2 1974-11-03
- Season 3 1976-01-04
- Season 4 1977-01-05
- Season 5 1978-01-04
- Season 6 1979-01-04
- Season 7 1980-01-15
- Season 8 1981-01-06
- Season 9 1982-01-10
- Season 10 1983-01-18
- Season 11 1984-01-17
- Season 12 1985-01-15
- Season 13 1986-01-21
- Season 14 1987-01-20
- Season 15 1988-01-19
- Season 16 1989-01-17
- Season 17 1990-01-09
- Season 18 1991-01-08
- Season 19 1992-01-14
- Season 20 1993-01-05
- Season 21 1994-01-18
- Season 22 1995-01-08
- Season 23 1995-10-10
- Season 24 1996-10-01
- Season 25 1997-10-07
- Season 26 1998-10-06
- Season 27 1999-10-05
- Season 28 2000-10-24
- Season 29 2001-10-02
- Season 30 2002-09-03
- Season 31 2003-09-30
- Season 32 2004-09-28
- Season 33 2005-09-20
- Season 34 2006-09-05
- Season 35 2007-10-09
- Season 36 2008-10-07
- Season 37 2009-10-06
- Season 38 2010-10-19
- Season 39 2011-09-07
- Season 40 2012-10-10
- Season 41 2013-09-11
- Season 42 2014-09-10
- Season 43 2015-09-16
- Season 44 2016-09-07
- Season 45 2018-01-10
- Season 46 2019-01-02
- Season 47 2020-02-05
- Season 48 2021-01-13
- Season 49 2022-02-01
- Season 50 2023-02-01
- Season 51 2024-01-31
- Season 52 2025-01-22
Season 52 Episode
- Season 31 Infinite Secrets
- Season 31 Who Killed the Red Baron?
- Season 31 The Elegant Universe: Einstein's Dream (1)
- Season 31 The Elegant Universe: String's the Thing (2)
- Season 31 The Elegant Universe: Welcome to the 11th Dimension (3)
- Season 31 Wright Brothers' Flying Machine
- Season 31 Magnetic Storm
- Season 31 Volcano Above the Clouds
- Season 31 MARS Dead or Alive
- Season 31 Secrets of the Crocodile Caves
- Season 31 Dogs and More Dogs
- Season 31 Descent Into the Ice
- Season 31 Crash of Flight 111
- Season 31 Life and Death in the War Zone
- Season 31 Hunt for the Supertwister
- Season 31 World in the Balance: The People Paradox (1)
- Season 31 World in the Balance: China Revs Up (2)
- Season 31 Battle Plan Under Fire
NOVA - Season 31 Episode 10 Secrets of the Crocodile Caves
6.90 55 minutes Rare lemurs and crocodiles with bizarre cave-dwelling behavior draw scientists to remote corner of Madagascar.
