• 

  Robert R. Cargill

  饰：自己

• 

  Paul Davies

  饰：自己

• 

  Erik Thompson

  饰：Self - Narrator,

• 

  Alex Filippenko

  饰：Self - Univ. of California, Berkeley

• 

  Clifford V. Johnson

  饰：Self - Univ. of Southern California,(as Clifford Johnson)