Distributia
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Wade DavisHimself - Explorer-in-Residence, National Geographic Society (as Dr. Wade Davis)
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Lance LewmanNarrator (voice)
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Peter SingerHimself - Bioethicist, Princeton University (as Prof. Peter Singer)
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David C. LewisHimself - Professor Emeritus of Community Health, Brown University (as Dr. David C. Lewis)
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Nick ThorpeHimself - Monk, Thamkrabok Monastery
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Guy PettersonHimself - Professor of Philosophy, University of Melbourne (as Dr. Guy Petterson)
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Jerome LeviHimself - Anthropologist, Carleton College (as Dr. Jerome Levi)
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John HalpernHimself - Psychiatrist, Harvard University (as Dr. John Halpern)
