Dallas Campbell
Himself - Presenter
Robert McNeill Alexander
Himself - Leeds University (archive footage)
Luiz Alvarez
Himself - University of California (archive footage)
David Archibald
Himself - San Diego State University (archive footage) (as Prof David Archibald)
Claire Belcher
Herself - Royal Holloway, University of London (archive footage)
Brent Breithaupt
Himself - Palaeontologist (archive footage)
Chris Brochu
Himself - University of Iowa (archive footage)
Julia Clarke
Herself - Palaeontologist (archive footage)
Philip Currie
Kristi Curry Rogers
Cesare Emiliani
Himself - Professor of Geology, University of Miami (archive footage)
Gregory Erickson
Himself - Florida State University (archive footage)
Alan Feduccia
Alan Hildebrand
Himself - Geological Survey of Canada (archive footage)
