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
Himself - Palaeontologist (archive footage)
Kristi Curry Rogers
Herself - Palaeontologist (archive footage)
Cesare Emiliani
Himself - Professor of Geology, University of Miami (archive footage)
Gregory Erickson
Himself - Florida State University (archive footage)
Alan Feduccia
Himself - University of California (archive footage)
Alan Hildebrand
Himself - Geological Survey of Canada (archive footage)
Florence McGovern
Herself - Fossil Dealer (archive footage)
Angela Milner
Herself - Natural History Museum (archive footage)
Simon Conway Morris
Himself - Evolutionary Palaeobiologist (archive footage)
John Ostrom
Himself - Yale University (archive footage)
Tim Rowe
Himself - University of Texas (archive footage)
Dale A. Russell
Himself - Paleobiologist, National Museums of Canada (archive footage)
