Jack Fortune

Jack Fortune

饰：Self - Narrator,

Patrick McCafferty

饰：Self - Queen's University Belfast

Simon Schaffer

Simon Schaffer

饰：Self - Cambridge University,(as Prof Simon Schaffer)

Michael Baillie

饰：Self - Queen's University Belfast,(as Prof Mike Baillie)

Monica Grady

Monica Grady

饰：Self - Open University,(as Prof Monica Grady)

弗雷德·霍伊尔

Fred Hoyle

饰：Self,(archive footage) (as Sir Fred Hoyle)

帕特里克·摩尔

Patrick Moore

饰：Self,(archive footage)

John D. Rummel

饰：Self - NASA,(as Dr John Rummel)

Chandra Wickramsinghe

饰：Self - Cardiff University,(as Prof Chandra Wickramasinghe)