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Jay O. Sanders  >  Himself - Narrator
Jay O. Sanders  >  Self - Narrator
Lance Lewman  >  Himself - Narrator
Will Lyman  >  Narrator (voice)
Liev Schreiber  >  Himself - Narrator
George Bush  >  Self - President of the United States (archive footage)
Craig Sechler  >  Himself - Narrator
Craig Sechler  >  Self - Narrator
Peter Thomas  >  Narrator (voice)
Kip Thorne  >  Himself
Neil deGrasse Tyson  >  Himself
Jeannette Robinson  >  Narrator
Gregory Benford  >  Himself
Tiziana Di Matteo  >  Herself
Johan Reinhard  >  Himself - National Geographic Explorer-in-Residence