Hana Seung / Joon Seung (12 episodes, 2016-2018)
Javier Delgado (12 episodes, 2016-2018)
Robert Foucault (12 episodes, 2016-2018)
Amelie Durand (12 episodes, 2016-2018)
Marta Kamen (12 episodes, 2016-2018)
Oliver Lee / Oliver (10 episodes, 2016-2018)
Leslie Richardson (9 episodes, 2016-2018)
Self - Author, How We'll Live On Mars (8 episodes, 2016-2018)
Self - CEO and Lead Designer, SpaceX (7 episodes, 2016-2018)
Self - Director, Hayden Planetarium (7 episodes, 2016-2018)
Ed Grann (6 episodes, 2016)
Mike Glenn / Lt. Michael Glenn (6 episodes, 2018)
Jen Carson (6 episodes, 2018)
Sam (6 episodes, 2016)
Shep Marster (6 episodes, 2018)
Ava Macon (6 episodes, 2016)
Kurt Hurrelle (6 episodes, 2018)
Self - Director of Space Policy, The Planetary Society (6 episodes, 2016-2018)
Dr. Jay Johar (5 episodes, 2018)
Self - Former Senior Editor for the Environment, National Geographic (5 episodes, 2018)
Commander Chen / Gan Chen (5 episodes, 2018)
Self - Creative Director, Voyager Interstellar Mission / Self - Creative Director, Voyager Interstellar Mission, NASA (5 episodes, 2016-2018)
Self - President, The Mars Society (5 episodes, 2016-2018)
Self - Co-Founder, Co-Chairman, Planetary Resources (5 episodes, 2016)
Cameron Pate (4 episodes, 2018)
Roland St. John (4 episodes, 2018)
Self - Investigative Journalist, Energy Analyst (4 episodes, 2018)
Zhenzhen Yow / Zhen Zhen Yow (4 episodes, 2018)
Director, Unit for Experimental Psychiatry / Self - Professor, University of Pennsylvania (4 episodes, 2016-2018)
Self - Author, 'The Martian' (4 episodes, 2016-2018)
Self - Smithsonian Institution (4 episodes, 2016)
Ben Sawyer (3 episodes, 2016)
DRB Solutions Senior Board Member (3 episodes, 2016)
Self - Arthur, 'Collapse' and 'Guns, Germs and Steel' / Self - Author, 'Collapse' and 'Guns, Germs and Steel' (3 episodes, 2018)
Self - Arthur, 'Light of the Stars: Alien Worlds and the Fate of the Earth' / Self - Author, 'Light of the Stars: Alien Worlds and the Fate of the Earth' (3 episodes, 2018)
Self - Author, The History of the World Series (3 episodes, 2018)
Self - Author, 'This Changes Everything: Capitalism vs. The Climate' (3 episodes, 2018)
Self - NASA Program Scientist for the Cryosphere (3 episodes, 2018)
Danny (3 episodes, 2018)
Russian Rep. Volkov (3 episodes, 2018)
Ms. Wilson (3 episodes, 2018)
Anika Chandra (3 episodes, 2018)
Assistant (3 episodes, 2018)
E.U. Rep. Davies (3 episodes, 2018)
Victoria Mcclain (3 episodes, 2016)
Self - Apollo 13 Commander (3 episodes, 2016)
Brandon Mcclain (3 episodes, 2016)
Breanna Maire Allmandinger (3 episodes, 2016)
Self - Associate Administrator, NASA / Self - Astrophysicist & Former Astronaut / Self - NASA Associate Administrator (3 episodes, 2016)
Self - Division Director, NASA Planetary Science (3 episodes, 2016)
Paul Richardson (2 episodes, 2016)
IMSF Member USA (2 episodes, 2016)
Self - Chair of Astrobiology, Library of Congress (2 episodes, 2018)
Self - Author, Mars Trilogy (2 episodes, 2018)
Self - Author, 'Pandemic: Tracking Contagions from Cholera to Ebola and Beyond) (2 episodes, 2018)
Self - Head of Energy Unit, Greenpeace Russia (2 episodes, 2018)
Self - Former Speaker, U.S. House of Representatives (2 episodes, 2018)
Self - Arctic Activist (2 episodes, 2018)
Self - Professor of Immunology and Infectious Disease, Harvard University (2 episodes, 2018)
Self - Glaciologist (2 episodes, 2018)
CEO, The Planetary Society / Self - Science Educator (2 episodes, 2018)
Nurse (2 episodes, 2018)
Chelsea Hurelle (2 episodes, 2018)
South Korean Rep. Kim (2 episodes, 2018)
Clerk (2 episodes, 2018)
Abby (2 episodes, 2018)
Nigerian Rep. Odogwu (2 episodes, 2018)
Ben Sawyer's Father (2 episodes, 2016)
IMSF American Member (2 episodes, 2016)
Former Astronaut / Self - Administrator, Former Astronaut, NASA / Self - Former NASA Administrator (2 episodes, 2016-2018)
Self - Project Systems Engineer, Jet Propulsion Laboratory (2 episodes, 2016)
Self - Research Scientist, NASA (2 episodes, 2016)
Self - Astrophysicist (2 episodes, 2016)
Young Ben Sawyer (1 episode, 2016)
Young Hana and Joon (1 episode, 2016)
Cygnus Pilot (1 episode, 2016)
Flight Director Mission Control (1 episode, 2016)
Louise Varda (1 episode, 2016)
IMSF Member (1 episode, 2016)
DRB Solutions Board Member (1 episode, 2016)
Joon's Assistant (1 episode, 2016)
Self - President, Eurasia Group (1 episode, 2018)
Self - Research and Development Scientist, NASA (1 episode, 2018)
Self - Author, 'Physics of the Future' (1 episode, 2018)
Self - Captain, Arctic Sunrise (1 episode, 2018)
Self - Actic Activist (1 episode, 2018)
Self - Former NASA Astronaut (1 episode, 2018)
Self - Production Operations Discipline Responsible (1 episode, 2018)
Self - Former NASA Chief Scientist (1 episode, 2018)
Chris Owens (1 episode, 2018)
Self - Climate Advocate (1 episode, 2018)
American Reporter (1 episode, 2018)
Self - Foreign Minister Finland (1 episode, 2018)
Self - President, Saami Council (1 episode, 2018)
British TV Reporter (1 episode, 2018)
Self - Foreign Minister, Sweeden (1 episode, 2018)
Man (1 episode, 2018)
American TV Reporter (1 episode, 2018)
Mother (1 episode, 2018)
Chinese TV Reporter (1 episode, 2018)
Anchor (1 episode, 2018)
IMSF Crew Member (1 episode, 2018)
Argentinian TV Reporter (1 episode, 2018)
Self - NASA Astronaut (1 episode, 2016)
Self - Elon Musk's Son (1 episode, 2016)
Self - Crew Architect, HI-SEAS (1 episode, 2016)
Self - Scott Kelly's Daughter (1 episode, 2016)
Self - Scott Kelly's Girlfriend (1 episode, 2016)
Self - NASA Human Space Flight Chief Flight Director (1 episode, 2016)
Self - Principal Investigator, HI-SEAS (1 episode, 2016)
Self - George Washington Univ. Space Policy Institute Founder (1 episode, 2016)
Self - Principal Investigator, ExoMars (1 episode, 2016)
Self - Director, Jet Propulsion Laboratory (1 episode, 2016)
Self - Deputy Project Director, Antarctic Support Contract (1 episode, 2016)
Self - NASA Administrator, Former Astronaut (1 episode, 2016)
Self - Chief Engineering Officer, HI-SEAS (1 episode, 2016)
Self - Director, White House Office of Science and Technology (1 episode, 2016)
Self - Director of Build Reliability, SpaceX (1 episode, 2016)
Self - Author, 'Packing for Mars' (1 episode, 2016)
Self - Geologist, University of Texas-Austin (1 episode, 2016)
Self - NASA One-Year Mission, Lead Science Integration (1 episode, 2016)
JAXA worker (uncredited) (2 episodes, 2016)
JAXA official (uncredited) (2 episodes, 2016)
Person watching launch (uncredited) (1 episode, 2016)
DRB Solutions Board Member (uncredited) (1 episode, 2016)
Solutions Board Member (uncredited) (1 episode, 2016)
IMSF Secretary General (uncredited) (1 episode, 2016)
Olympos Town Resident (uncredited) (1 episode, 2016)