Actori
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Morgan FreemanSelf - Narrator
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Samuel L. Jacksonel însuși
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Robin WilliamsSelf
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Benedict Cumberbatchnarator
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Bill PaxtonNarrator (US version)
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Eli RothSelf - Host
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Stephanie LeonidasPinaruti
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Martin SheenHimself - Narrator (2 episodes, 2011)
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Terry O'QuinnSelf - Host
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Josh CharlesNarrator (4 episodes, 2012)
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Stephen HawkingSelf - Host
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Phil CheadleLeading Fireman Fred Barrett
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Max TegmarkSelf - Cosmologist
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Sean BarrettSelf - Narrator
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James FallonSelf - UC Irvine