Name	Known for
Paul Essiembre Self - Narrator (voice) Self - Narrator (voice) See fewer	The Ice Road (2021)
Paul Davies Self - Physicist, Arizona State University (as Prof. Paul Davies) Self - Physicist, Arizona State University (as Prof. Paul Davies) See fewer	Alien Encounters (2012)
Carlton Allen Self - Astromaterials Curator, NASA Johnson Space Center (as Dr. Carlton Allen) Self - Astromaterials Curator, NASA Johnson Space Center (as Dr. Carlton Allen) See fewer	Aliens: The Definitive Guide (2013)
Mike Zolensky Self - Mineroloist, NASA Johnson Space Center (as Dr. Mike Zolensky) Self - Mineroloist, NASA Johnson Space Center (as Dr. Mike Zolensky) See fewer	Meteorite Men (2009)
Kevin Warwick Self - Cyberneticist, University of Reading (as Prof. Kevin Warwick) Self - Cyberneticist, University of Reading (as Prof. Kevin Warwick) See fewer	The Sci-Fi Files (1997)
Les Johnson Self - Physicist, NASA Advanced Concepts Office Self - Physicist, NASA Advanced Concepts Office See fewer	How to Survive the End of the World (2013)
John Pye Self - Astrophysicist, University of Leicester (as Dr. John Pye) Self - Astrophysicist, University of Leicester (as Dr. John Pye) See fewer	Aliens: The Definitive Guide (2013)
Michael Barratt Self - Astronaut, NASA Johnson Space Center (as Dr. Michael Barratt) Self - Astronaut, NASA Johnson Space Center (as Dr. Michael Barratt) See fewer	One Nation Under Canada
Michio Kaku Self - Theoretical Physicist, City University of New York (as Dr. Michio Kaku) Self - Theoretical Physicist, City University of New York (as Dr. Michio Kaku) See fewer	Accidental Truth: UFO Revelations (2023)
Harold White Self - Physicist, NASA Johnson Space Center (as Dr. Harold White) Self - Physicist, NASA Johnson Space Center (as Dr. Harold White) See fewer	How the Universe Works (2010)
Lewis Dartnell Self - Astrobiologist, University College, London (as Dr. Lewis Dartnell) Self - Astrobiologist, University College, London (as Dr. Lewis Dartnell) See fewer	Size Matters (2018)
Douglas Vakoch Self - Director of Interstellar Message Composition, SETI Institute (as Dr. Doug Vakoch) Self - Director of Interstellar Message Composition, SETI Institute (as Dr. Doug Vakoch) See fewer	Rendezvous with the Future (2022)
Geoff Marcy Self - Astronomer, University of California, Berkeley (as Prof. Geoff Marcy) Self - Astronomer, University of California, Berkeley (as Prof. Geoff Marcy) See fewer	Extreme Universe (2010)
Charles Cockell Self - Astrobiologist, University of Edinburgh (as Prof. Charles Cockell) Self - Astrobiologist, University of Edinburgh (as Prof. Charles Cockell) See fewer	Nina Goes to Mars
Rupert Graves Narrator Narrator See fewer	Sherlock (2010)
Ronald Reagan Self - President (archive footage) Self - President (archive footage) See fewer	Kings Row (1942)