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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)

Mike Rowe
Self - Narrator (archive sound)

Michelle Thaller
Self - Narrator (archive sound)

Neil deGrasse Tyson
Self - Narrator (archive sound)