James S. Bullock

饰：(as James Bullock)

理查德·林特恩

Richard Lintern

饰：Self - Narrator

麦克·罗维

Mike Rowe

饰：Narrator

Hakeem Oluseyi

饰：Self - Astrophysicist

Michelle Thaller

饰：Self - Astronomer

Moogega Cooper

饰：(as Moogega Stricker)

劳伦斯·M.克劳斯

Lawrence M. Krauss

饰：(as Lawrence M Krauss)

Phil Plait

饰：Self - Astronomer

麦克斯·泰格马克

Max Tegmark

饰：Self - Theoretical Physicist