Distributia
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Erik DellumsHimself - Narrator (voice) (as Erik Todd Dellums)
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Albert EinsteinHimself - Theoretical Physicist (archive footage)
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Michio KakuHimself - Theoretical Physicist
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Richard LinternHimself - Narrator
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Mike RoweHimself - Narrator (voice)
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Alan GuthHimself - Theoretical Physicist
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Janna LevinHerself - Theoretical Physicist
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Phil PlaitHimself - Astronomer
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Max TegmarkHimself - Theoretical Physicist
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Lawrence KraussHimself - Cosmologist (as Lawrence M Krauss)
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Michelle ThallerHerself - Astronomer
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Sean CarrollHimself - Cosmologist
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Arno PenziasHimself - Physicist, Radio Astronomer (archive footage)
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David SpergelHimself - Theoretical Physicist
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Hakeem OluseyiHimself, Astrophysicist