埃里克·德拉姆斯
Erik Dellums
饰：Narrator
Christopher Orwoll
饰：Himself - Director, New Mexico Museum of Space History
Marc D'Antonio
饰：Himself - Chief Image Analyst, MUFON
Nick Pope
饰：Himself - Military Analyst
James E. Oberg
饰：Himself - Ex-NASA Engineer
Mike Capps
饰：Himself - Technology Theorist
Matt Genge
饰：Himself - Planetary Scientist
Kevin R. Grazier
饰：Himself - Planetary Scientist
J.J. Kavelaars
饰：Himself - Astronomer
Laurence Garvie
饰：Himself - Meteoriticist, Arizona State University
Pascal Lee
饰：Himself - Planetary Scientist
Kevin H. Baines
饰：Himself - Planetary Scientist
大卫·布林
David Brin
饰：Himself - Phd., SF Author & Astrophysicist
Amy Shira Teitel
饰：Herself - Space Historian and Author
William J. Birnes
William J. Birnes
饰：Self - Author, 'The Day After Roswell'
Seth Shostak
饰：Self - Senior Astronomer, SETI Institute
焦立中
Leroy Chiao
饰：Self - NASA Shuttle Astronaut
Joe Gutheinz
饰：Self - Former NASA Senior Special Agent
James W. Huston
饰：Self - Author and Defense Expert
Jerry Linenger
饰：Self
Doug Vakoch
饰：Self
Harrison Schmitt
饰：Self - Geologist and Apollo 17 Astronaut
Robert Pearlman
饰：Self - Space Historian
Travis S. Taylor
饰：Self
Story Musgrave
饰：Self - Astronaut
Alfred McEwen
饰：Self - Planetary Geologist
Leland Melvin
饰：Self - NASA Shuttle Astronaut
Andrew Chaikin
Andrew Chaikin
饰：Self - Space Historian and Author: A Man on the Moon
Kathy Marden
饰：Self
Richard Terrile
Richard Terrile
饰：Self
Walter Cunningham
饰：Self - Apollo 7 Astronaut
加来道雄
Michio Kaku
饰：Self
Jeff Wise
饰：Self
Linda Zimmerman
饰：Self
John D. Rummel
饰：Self - Senior Scientist, SETI Institute
罗斯·穆兰
Ross Mullan
饰：Gemini 10 Astronaut
加文·霍夫曼
Gavin Heffernan
饰：Self
Swaylee Loughnane
Swaylee Loughnane
饰：Scientist
Roger Launius
饰：Self - National Air and Space Museum
Addison Bain
饰：Self - NASA Scientist
David G. Marwell
饰：Self - JFK Assassination Historian
Don Eyles
饰：Self - Apollo 11 Software Engineer
Stanton Friedman
饰：Self - Nuclear Physicist
Hakeem Oluseyi
饰：Self - Astrophysicist
Alan Bean
饰：Self - Apollo 12 Astronaut
Al Worden
Al Worden
饰：Self - Apollo 15 Command Module Pilot
Andrew Gough
饰：Self
Sara Seager
饰：Self - Planetary Scientist
Chris Rutkowski
饰：Self - Science Writer
Richard Jurek
饰：Self - Space Historian
Seth Porges
饰：Self - Technology Writer
查尔斯·杜克
Charles Duke
饰：Self - Apollo 11 Cap-Com
Jerry Pournelle
饰：Self - Sci-Fi Writer and Former Weapons Designer
Russet J. McMillan
饰：Self - PhD, Astronomer
Fran Bagenal
饰：Self - Professor of Astrophysical and Planetary Sciences
马特·沃尔顿
Matt Walton
饰：Self - Narrator
Sian Proctor
饰：Self
Athena Brensberger
Athena Brensberger
饰：Self
Ralph Lorenz
饰：Self - Planetary Scientist
Chandra Wickramsinghe
饰：Self - Astrobiologist
Brian Weeden
饰：Self - Space Policy Expert
John Brandenberg
饰：Self
John Pohlhammer
饰：Gemini 10 Astronaut
Edgar D. Mitchell
饰：Self - Phd, Apollo 14 Astronaut
Jerry Ehman
饰：Self - Phd, Astronomer
Steve Vogt
饰：Self - Astrophysicist and Planet Hunter
Alfred Worden
Alfred Worden
饰：Himself - Apollo Astronaut
Brittany Brand
饰：Self - Volcanologist, Boise State University
Dirk Schulze-Makuch
饰：Self - Astrobiologist
Donald R. Schmitt
Donald R. Schmitt
饰：Self
Stephon Alexander
饰：Self