Erik Thompson as Narrator

Paul Davies as Self - Physicist, Author, 'The Mind of God'

Robert R. Cargill as Self - University of Iowa

Alex Filippenko as Self - Univ. of California, Berkeley

Laura Danly as Self - Griffith Observatory

Clifford V. Johnson as Self - Univ. of Southern California

Robert Spitzer as Self - Magis Center of Reason and Faith

Leonard Mlodinow as Self - Co-Author, 'The Grand Design'

Stephen Hawking as Self - Co-Author, 'The Grand Design'

Dana Smelzer as