Boris Chertok

饰：Self - Engineer, Soviet Space Programme

玛克辛·皮克

Maxine Peake

饰：Self - Narrator

弗雷德·霍伊尔

Fred Hoyle

饰：(archive footage)

Jon Agar

饰：(as Prof Jon Agar)

Jocelyn Bell Burnell

饰：(as Prof Jocelyn Bell Burnell)

Bernard Lovell

饰：(archive footage)

艾伦·加纳

Alan Garner

饰：Self - Novellist

詹姆斯· 伯克

James Burke

饰：Self - Broadcaster

安东尼·弗里温

Anthony Frewin

饰：Self - Former Assistant to Stanley Kubrick