| episode | air date | countdown | title |
| S08E04 | 2017-05-16 | | Is Gun Crime a Virus? | |
| S08E03 | 2017-05-09 | | Can We Hack the Planet? | |
| S08E02 | 2017-05-02 | | Can We Cheat Death? | |
| S08E01 | 2017-04-25 | | Is the Force With Us? | |
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| S07E04 | 2016-09-20 | | Can We All Become Geniuses? | |
| S07E03 | 2016-09-13 | | Are There More Than Two Sexes? | |
| S07E02 | 2016-09-06 | | Is Privacy Dead? | |
| S07E01 | 2016-08-30 | | What Makes a Terrorist? | |
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| S06E06 | 2015-06-02 | | Why Do We Lie? | |
| S06E05 | 2015-05-12 | | Are We Here for a Reason? | |
| S06E04 | 2015-05-05 | | Can Time Go Backwards? | |
| S06E03 | 2015-04-28 | | Are We All Bigots? | |
| S06E02 | 2015-04-23 | | Do We Live in the Matrix? | |
| S06E01 | 2015-04-23 | | Are There Aliens Inside Us? | |
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| S05E10 | 2014-06-04 | | When Did Time Begin? | |
| S05E09 | 2014-07-23 | | Is There a Shadow Universe? | |
| S05E08 | 2014-07-16 | | Will We Become God? | |
| S05E07 | 2014-07-09 | | Is Gravity an Illusion? | |
| S05E06 | 2014-07-02 | | Is a Zombie Apocalypse Possible? | |
| S05E05 | 2014-06-25 | | Does the Ocean Think? | |
| S05E04 | 2014-06-25 | | How to Collapse a Superpower | |
| S05E03 | 2014-06-11 | | Is Poverty Genetic? | |
| S05E02 | 2014-03-12 | | Is Luck Real? | |
| S05E01 | 2014-03-05 | | Is God an Alien Concept? | |
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| S04E10 | 2013-07-31 | | Did God Create Evolution? | |
| S04E09 | 2013-07-24 | | Do We Have Free Will? | |
| S04E08 | 2013-07-17 | | Is Reality Real? | |
| S04E07 | 2013-07-10 | | Are Robots the Future of Human Evolution? | |
| S04E06 | 2013-07-03 | | Can Our Minds Be Hacked? | |
| S04E05 | 2013-06-26 | | Will Sex Become Extinct? | |
| S04E04 | 2013-06-19 | | How Do Aliens Think? | |
| S04E03 | 2013-06-12 | | Can We Outlive the Sun? | |
| S04E02 | 2013-06-05 | | When Does Life Begin? | |
| S04E01 | 2013-03-20 | | Is There a God Particle? | |
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| S03E10 | 2012-08-08 | | Did We Invent God? | |
| S03E09 | 2012-08-01 | | Will Eternity End? | |
| S03E08 | 2012-07-25 | | Mysteries of the Subconscious | |
| S03E07 | 2012-07-18 | | Can We Eliminate Evil? | |
| S03E06 | 2012-07-11 | | Can We Resurrect the Dead? | |
| S03E05 | 2012-06-27 | | What is Nothing? | |
| S03E04 | 2012-06-20 | | What Makes Us Who We Are? | |
| S03E03 | 2012-06-13 | | Is The Universe Alive? | |
| S03E02 | 2012-06-06 | | Is There a Superior Race? | |
| S03E01 | 2012-03-06 | | Will We Survive First Contact? | |
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| S02E10 | 2011-09-04 | | Are There Parallel Universes? | |
| S02E09 | 2011-08-03 | | What Do Aliens Look Like? | |
| S02E08 | 2011-07-27 | | Can We Live Forever? | |
| S02E07 | 2011-07-20 | | Can We Travel Faster Than Light? | |
| S02E06 | 2011-07-13 | | How Does the Universe Work? | |
| S02E05 | 2011-07-06 | | Is There a Sixth Sense? | |
| S02E04 | 2011-06-29 | | Are There More Than 3 Dimensions? | |
| S02E03 | 2011-06-22 | | Does Time Really Exist? | |
| S02E02 | 2011-06-15 | | Is There an Edge to the Universe? | |
| S02E01 | 2011-06-08 | | Is There Life After Death? | |
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| S01E08 | 2010-07-28 | | Beyond the Darkness | |
| S01E07 | 2010-07-21 | | What Are We Really Made of? | |
| S01E06 | 2010-07-14 | | Are We Alone? | |
| S01E05 | 2010-07-05 | | How Did We Get Here? | |
| S01E04 | 2010-06-30 | | What Happened Before the Beginning? | |
| S01E03 | 2010-06-23 | | Is Time Travel Possible? | |
| S01E02 | 2010-06-16 | | The Riddle of Black Holes | |
| S01E01 | 2010-06-09 | | Is There a Creator? | |
