NOVA — Season 31

E01 Mars: Dead Or Alive 04 Jan 2004 E02 Secrets Of The Crocodile Caves 20 Jan 2004 E03 Dogs And More Dogs 03 Feb 2004 E04 Descent Into The Ice 10 Feb 2004 E05 Crash Of Flight 111 17 Feb 2004 E06 Life And Death In The War Zone 02 Mar 2004 E07 Hunt For The Supertwister 30 Mar 2004 E08 World In The Balance: The People Paradox (1) 20 Apr 2004 E09 World In The Balance: China Revs Up (2) 20 Apr 2004 E10 Battle Plan Under Fire 04 May 2004 E11 Origins (1): Earth is Born 28 Sep 2004 E12 Origins (2): How Life Began 28 Sep 2004 E13 Origins (3): Where Are The Aliens? 29 Sep 2004 E14 Origins (4): Back To The Beginning 29 Sep 2004 E15 The Most Dangerous Woman In America 12 Oct 2004 E16 America's Stone Age Explorers 09 Nov 2004 E17 Great Escape 16 Nov 2004 E18 Ancient Refuge In The Holy Land 23 Nov 2004