Distributia
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Morgan FreemanHimself - Narrator
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Albert EinsteinHimself - Theoretical physicist (archive footage)
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Edwin HubbleHimself - Astronomer (archive footage)
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Paul SteinhardtHimself - Theoretical physicist, Princeton University
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Frank TiplerHimself - Mathematical physicist (as Dr. Frank J. Tipler)
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Max TegmarkHimself - Theoretical physicist
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Andrei LindeHimself - Cosmologist
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Joanne HewettHerself - Theoretical physicist, Stanford Linear Accelerator, California