麦克·罗维

Mike Rowe

饰：Narrator

Phil Plait

饰：Self - Astronomer

劳伦斯·M.克劳斯

Lawrence M. Krauss

饰：(as Lawrence M Krauss)

Moogega Cooper

饰：Self - Planetary Protection Engineer

理查德·林特恩

Richard Lintern

饰：Self - Narrator

Hakeem Oluseyi

饰：Himself - Astrophysicist

Michelle Thaller

饰：Self - Astronomer

Dan Durda

饰：Self - Planetary Scientist

James S. Bullock

饰：(as James Bullock)