Cast ~
David Attenborough
-Self - Narrator (archive sound)
Sean Carroll
-Self - Narrator (archive sound)
Craig Childs
-Self - Narrator (archive sound)
Brian Cox
-Self - Narrator (archive sound)
Alex Filippenko
-Self - Narrator (archive sound)
Stephen Hawking
-Self - Narrator (archive sound)
Michio Kaku
-Self - Narrator (archive sound)
Lawrence Krauss
-Self - Narrator (archive sound)
Janna Levin
-Self - Narrator (archive sound)
Phil Plait
-Self - Narrator (archive sound)
Martin Rees
-Self - Narrator (archive sound)
Michelle Thaller
-Self - Narrator (archive sound)
Neil deGrasse Tyson
-Self - Narrator (archive sound)
Mike Rowe
-Self - Narrator (archive sound)
