Season 7
Episodes
1 Human Extinction Jan 15, 2005 2 Earth Without The Moon Feb 4, 2010 3 Finding the Origin of Life Feb 11, 2010 4 Traveler's Guide to Mars Feb 14, 2010 
5 Preventing Armageddon Feb 18, 2010 6 Hunt for Aliens Apr 1, 2010 
7 Expedition Apocalypse Apr 8, 2010 10 Iceland Volcano Eruption Apr 29, 2010 12 Dead Tired Jun 17, 2010 13 21st Century Submarine Jun 24, 2010 14 Easter Island Eclipse Jul 11, 2010 15 Swallowed by the Sun Jul 22, 2010 17 Lightning Chasers Aug 5, 2010 18 Man-Made Disasters Nov 1, 2010 19 City Under the Sea Nov 10, 2010 20 Ancient Sea Monsters Nov 18, 2010 21 Alien Fireballs Dec 2, 2010 24 Was Darwin Wrong? 25 Snowball Earth Aug 22, 2010 
26 Living On The Moon Jul 19, 2009 27 Twister Outbreak 28 Secret World Of Fireworks Jul 2, 2009
5 Preventing Armageddon Feb 18, 2010 6 Hunt for Aliens Apr 1, 2010 7 Expedition Apocalypse Apr 8, 2010 10 Iceland Volcano Eruption Apr 29, 2010 12 Dead Tired Jun 17, 2010 13 21st Century Submarine Jun 24, 2010 14 Easter Island Eclipse Jul 11, 2010 15 Swallowed by the Sun Jul 22, 2010 17 Lightning Chasers Aug 5, 2010 18 Man-Made Disasters Nov 1, 2010 19 City Under the Sea Nov 10, 2010 20 Ancient Sea Monsters Nov 18, 2010 21 Alien Fireballs Dec 2, 2010 24 Was Darwin Wrong? 25 Snowball Earth Aug 22, 2010 26 Living On The Moon Jul 19, 2009 27 Twister Outbreak 28 Secret World Of Fireworks Jul 2, 2009