Dallas Campbell as Himself - Presenter

Robert McNeill Alexander as Himself - Leeds University (archive footage)

Luiz Alvarez as Himself - University of California (archive footage)

David Archibald as Himself - San Diego State University (archive footage) (as Prof David Archibald)

Claire Belcher as Herself - Royal Holloway, University of London (archive footage)

Brent Breithaupt as Himself - Palaeontologist (archive footage)

Chris Brochu as Himself - University of Iowa (archive footage)

Julia Clarke as Herself - Palaeontologist (archive footage)

Philip Currie as Himself - Palaeontologist (archive footage)

Kristi Curry Rogers as Herself - Palaeontologist (archive footage)

Cesare Emiliani as Himself - Professor of Geology, University of Miami (archive footage)

Gregory Erickson as Himself - Florida State University (archive footage)

Alan Feduccia as Himself - University of California (archive footage)

Alan Hildebrand as Himself - Geological Survey of Canada (archive footage)

Florence McGovern as Herself - Fossil Dealer (archive footage)

Angela Milner as Herself - Natural History Museum (archive footage)

Simon Conway Morris as Himself - Evolutionary Palaeobiologist (archive footage)

John Ostrom as Himself - Yale University (archive footage)

Tim Rowe as Himself - University of Texas (archive footage)

Dale A. Russell as Himself - Paleobiologist, National Museums of Canada (archive footage)