On screen · 15

1. ND
   Neil deGrasse TysonFamily Guyas Neil deGrasse Tyson (voice)Cosmosas Self - Host
2. JM
   Jonathan Morgan HeitFamily Guyas (voice)Cosmosas John Herschel (voice)
3. PS
   Patrick StewartFamily Guyas Baby Susie Swanson (Inner Voice) (voice)Cosmosas William Herschel (voice)
4. FT
   Fred TatascioreFamily Guyas (voice)Cosmosas Democritus (voice)
5. AS
   André SogliuzzoFamily Guyas (voice)Cosmosas Weichelberger (voice)
6. MM
   Marlee MatlinFamily Guyas Stella (voice)Cosmosas Annie Jump Cannon (voice)
7. PM
   Piotr MichaelFamily Guyas Police Captain (voice)Cosmosas Lab Assistant (voice)
8. CE
   Cary ElwesFamily Guyas Edison's Assistant (voice)Cosmosas Edmond Halley / Robert Hooke (voice)
9. ER
   Enn ReitelFamily Guyas (voice)Cosmoscast
10. AM
    Alfred MolinaFamily Guyas David Attenborough / Dr. Snelling (voice)Cosmosas Ibn al-Haytham (voice)
11. JH
    Judd HirschFamily Guyas Judd Hirsch (voice)Cosmosas Robert Oppenheimer (voice)
12. OV
    Oliver VaquerFamily Guyas (voice)Cosmosas Joseph von Fraunhofer (voice)
13. AS
    Alan ShearmanBothas (voice)
14. AS
    Alexander SiddigFamily Guyas London Silly Nannies Player (voice)Cosmosas Isaac Newton (voice)
15. AS
    Amanda SeyfriedFamily Guyas Ellie (voice)Cosmosas Marie Tharp (voice)