Ηθοποιοί επεισοδίου
Hakeem Muata OluseyiSelf - Astrophysicist
Anthony D. CallSelf - Narrator
Alan Dean FosterSelf - Author
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Dean Morrison MaderaSchool Student
Seth ShostakSelf - Senior Astronomer, SETI Institute
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David GerroldSelf - Author
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Joan SlonczewskiSelf - Microbiologist
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Kevin R. GrazierSelf - Planetary Scientist
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Ariel AnbarSelf Astrobiology
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Jeffrey L. BadaSelf
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Joe CapeChinese Astronomer
Freddie De GrateBiologist
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Nicole NascaHospital Orderly
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Ray ChaoChief Asian Astronomer