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)