- 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)
- Simon Conway Morris - Himself - Evolutionary Palaeobiologist (archive footage)
- John Ostrom - Himself - Yale University (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 hace el papel de Himself - San Diego State University (archive footage) (as Prof David Archibald).
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 interpreta a Himself - Palaeontologist (archive footage) en la película.
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 hace el papel de Himself - University of California (archive footage).
Alan Hildebrand interpreta a Himself - Geological Survey of Canada (archive footage) en la película.
Florence McGovern hace el papel de Herself - Fossil Dealer (archive footage).
Angela Milner hace el papel de Herself - Natural History Museum (archive footage).
Simon Conway Morris interpreta a Himself - Evolutionary Palaeobiologist (archive footage) en la película.
John Ostrom hace el papel de Himself - Yale University (archive footage).
Tim Rowe interpreta a Himself - University of Texas (archive footage) en la película.
Dale A. Russell interpreta a Himself - Paleobiologist, National Museums of Canada (archive footage) en la película.
Capítulo disponible en las siguientes plataformas:
