Carl Sagan

Carl Sagan first made a cameo appearance in Einstein vs Stephen Hawking. He will appear again in Sir Isaac Newton vs Bill Nye. Both times he was portrayed by EpicLLOYD.

Information on the Cameo
Carl Edward Sagan (November 9, 1934 – December 20, 1996) was an American astronomer, astrophysicist, cosmologist, author, science popularizer, and science communicator in astronomy and natural science. He is mostly known for the books he wrote, as well as his dedication to finding extraterrestial life. For most of his career, he was a professor of astronomy at the Cornell University. He also co-wrote the 13-part series: 'Cosmos, A Personal Voyage' featuring the famous line "If you wish to make an apple pie from scratch, you must first invent the universe.". At the age of 62, Sagan died of pneumonia.

Einstein vs Stephen Hawking
Sagan appeared after Stephen Hawking said the line, "I'm about to bake raps from scratch like Carl Sagan." He appeared again when Stephen Hawking said "I'm a super computer, you're like a TI-82!" during the "Ooh!" at the end.

Sir Isaac Newton vs Bill Nye
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Lyrics
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Trivia

 * He is the first cameo to return much later as a rapper, not including those first glimpsed as "previews" when their battles were already planned (such as Master Chief and Superman).
 * However, he is not the first cameo to return with a speaking role. The first was the Stormtrooper.
 * The second would be George Washington, although Washington returning as a rapper was revealed before Sagan.