Neil deGrasse Tyson
Self - Host
Ann Druyan
Carl Sagan
Self (archive footage)
Seth MacFarlane
Sherwood Rowland (voice)
Sasha Sagan
Rachel Molly Gruber
Stoney Emshwiller
André Sogliuzzo
Weichelberger (voice)
Christopher Emerson
Acolyte (voice)
Piotr Michael
Edmund Muskie (voice)
Enn Reitel
Henry Norris Russell (voice)
Keythe Farley
(voice)
Patrick Stewart
William Herschel (voice)
Elizardo Torrez
Young Carl Sagan
Trang Vo
(voice)
John Steven Rocha
Bellaramine (voice)
Paul Telfer
Angry Scholar #2 (voice)
Jonathan Morgan Heit
John Herschel (voice)
Cary Elwes
Edmond Halley / Robert Hooke (voice)
Tom Konkle
Samuel Pepys (voice)
Alexander Siddig
Isaac Newton (voice)
Alfred Molina
Ibn al-Haytham (voice)
Richard Gere
Clair Patterson (voice)
Marc Worden
Harrison Brown (voice)
Kirsten Dunst
Cecilia Payne (voice)
Marlee Matlin
Annie Jump Cannon (voice)
Peggy Jo Jacobs
Margaret Harwood (voice)
Amanda Seyfried
Marie Tharp (voice)
Christiane Amanpour
Enheduanna (voice)
Michael Chochol
Jan Oort
Oliver Vaquer
Joseph von Fraunhofer (voice)
Fred Tatasciore
Democritus (voice)
Larry Cedar
Nick Jameson
Michael McConnohie
Masasa Moyo
Martin Jarvis
Humphry Davy (voice)
Noah Langford
(voice)
Fay Masterson
(voice)
Heiko Obermöller
Einstein's Father (voice)
Julian Ovenden
Michael Faraday (voice)
