Reparto (por orden de créditos)
David Morrissey
Self - Narrator (voice)
Piers Sellers
Self - NASA Astronaut
Rob Edwards
Self - Head of Science, Royal Observatory
Mark Maslin
Self - Department of Geography, UCL
Maggie Aderin-Pocock
Self - Space Scientist
Susan Jebb
Self - Nutrition Scientist, Medical Research Council
Simon Boxall
Self - National Oceanography Centre
Anson MacKay
Self - Reader, UCL
Geoff Bailey
Self - Department of Archaeology, York University