| Robert McNeill Alexander |
Himself - Biomechanics Specialist |
| Leticia Aviles |
Herself - Evolutionary Biologist |
| Phillip Currie |
Himself - Palaeoornithologist |
| Richard Fortey |
Himself - Senior Palaeontologist |
| William Gilly |
Himself - Cell and Developmental Biology and Marine Biology |
| Stephen Harris |
Himself - Mammalogist |
| Kurt M. Kotrschal |
Himself - Zoological Institute |
| Roy Livermore |
Himself - Palaeongeographer |
| Karl J. Niklas |
Himself - Professor of Plant Biology |
| Stephen R. Palumbi |
Himself - Professor in Marine Sciences |
| Christian Rodska |
Narrator |
| Jeremy Rayner |
Himself - Alexander Professor of Zoology, University of Leeds, UK |
| Bruce H. Tiffney |
Himself - Palaeobotanist, University of California, USA |