Cast principale
Erik Thompson
Narrator
Paul Davies
Self - Physicist, Author, 'The Mind of God'
Robert R. Cargill
Self - University of Iowa
Alex Filippenko
Self - Univ. of California, Berkeley
Laura Danly
Self - Griffith Observatory
Clifford V. Johnson
Self - Univ. of Southern California
Robert Spitzer
Self - Magis Center of Reason and Faith
Leonard Mlodinow
Self - Co-Author, 'The Grand Design'