- 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)
- Penny Palmer
- Sacha Baveystock
- Penny Palmer
Dallas Campbell interpreta a Himself - Presenter en la película.
Robert McNeill Alexander interpreta a Himself - Leeds University (archive footage) en la película.
Luiz Alvarez interpreta a Himself - University of California (archive footage) en la película.
David Archibald interpreta a Himself - San Diego State University (archive footage) (as Prof David Archibald) en la película.
Claire Belcher interpreta a Herself - Royal Holloway, University of London (archive footage) en la película.
Brent Breithaupt interpreta a Himself - Palaeontologist (archive footage) en la película.
Chris Brochu hace el papel de Himself - University of Iowa (archive footage).
Julia Clarke interpreta a Herself - Palaeontologist (archive footage) en la película.
Philip Currie hace el papel de Himself - Palaeontologist (archive footage).
Kristi Curry Rogers interpreta a Herself - Palaeontologist (archive footage) en la película.
Cesare Emiliani interpreta a Himself - Professor of Geology, University of Miami (archive footage) en la película.
Gregory Erickson interpreta a Himself - Florida State University (archive footage) en la película.
Alan Feduccia interpreta a Himself - University of California (archive footage) en la película.
Alan Hildebrand interpreta a Himself - Geological Survey of Canada (archive footage) en la película.
Florence McGovern interpreta a Herself - Fossil Dealer (archive footage) en la película.
Angela Milner interpreta a Herself - Natural History Museum (archive footage) en la película.
Simon Conway Morris interpreta a Himself - Evolutionary Palaeobiologist (archive footage) en la película.
John Ostrom interpreta a Himself - Yale University (archive footage) en la película.
Tim Rowe interpreta a Himself - University of Texas (archive footage) en la película.
Dale A. Russell hace el papel de Himself - Paleobiologist, National Museums of Canada (archive footage).
Capítulo disponible en las siguientes plataformas:
