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Self - Host
26 episodes
Self (archive footage), Self (voice) (archive footage)
8 episodes
President Harry S. Truman (voice), Sherwood Rowland (voice), (voice), Giordano Bruno (voice)
4 episodes
Rachel Molly Gruber
3 episodes
Guard (voice)
2 episodes
Weichelberger (voice), Christopher Wren (voice)
Acolyte (voice)
Edmund Muskie (voice), Lab Assistant (voice)
Henry Norris Russell (voice)
(voice)
William Herschel (voice)
Young Carl Sagan
(voice), Birthmark Woman
Bellaramine (voice)
1 episode
Angry Scholar #2 (voice)
John Herschel (voice)
Edmond Halley / Robert Hooke (voice)
Samuel Pepys (voice)
Isaac Newton (voice)
Ibn al-Haytham (voice)
Clair Patterson (voice)
Harrison Brown (voice)
Cecilia Payne (voice)
Annie Jump Cannon (voice)
Margaret Harwood (voice)
Marie Tharp (voice)
Enheduanna (voice)
Jan Oort
Joseph von Fraunhofer (voice)
Democritus (voice)
Humphry Davy (voice)
Einstein's Father (voice)
Michael Faraday (voice)
Bruce Heezen (voice)
Augustin Mouchot (voice)
Self (archive footage)
Self (voice) (archive footage)
Monk (voice)
Ashoka (voice)
Female Voyager (voice)
Male Voyager (voice)
Caroline Herschel (voice)
Nikolai Vavilov (voice)
John Goodricke
Charles Darwin
Christiaan Huygens
Neil Armstrong
Thomas Young
Robert Oppenheimer (voice)
Marie Curie (voice)
Young Father
Albert Einstein
Samuel Sagan
World's Fair Attendee
Young Neil deGrasse Tyson
Young Stephen Joseph Tyson
