Neil deGrasse Tyson

Self - Host

Seth MacFarlane

Self - President Harry S. Truman, Self - Sherwood Rowland

Trang Vo

Self - Birthmark Teen, Self - Birthmark Child, Self - Birthmark Woman

Sasha Sagan

Self - Rachel Molly Gruber

Carl Sagan

Self

Shereen Balles

Self - Female Voyager

Elizardo Torrez

Self - Young Carl Sagan

Eric Lyons

Self - Native Spanish Speaker

J. Nathan Simmons

Self - Refugee

Viggo Mortensen

Self - Nikolai Vavilov

Patrick Stewart

Self - William Herschel

Ernie Vigil

Self - Thomas Young

Marcelo Tubert

Self

Adam Tsekhman

Self - Christiaan Huygens

Steve Oatway

Self - Charles Darwin

Masoumeh Husseini

Self - Monk

Judd Hirsch

Self - Robert Oppenheimer