William Shatner (Self - Host), David Tholen (Self - Astronomer, Univ. of Hawaii), Michael Dennin (Self - Physicist, UC Irvine), Jason Wright (Self - Prof. of Astrophysics, Penn State), Paul Sutter (Self - Theoretical Cosmologist), Michio Kaku (Theoretical Physicist / Self - Author), Graham Lau (Self - Research Investigator: Blue Marble Space), Richard Hoover (Self - Astrobiologist), Amy Shira Teitel (Self - Author, Breaking the Chains of Gravity), Rakesh Mogul (Self - Prof. of Biological Chemistry, Cal Poly Pomona)