Lance Lewman
Narrator
Kirk Johnson
Himself - Denver Museum of Nature & Science
?
Daniel Fisher
Himself - University of Michigan
?
Ian Miller
Himself - Denver Museum of Nature & Science
?
Joseph Sertich
Himself - Vertebrate Paleontologist
?
Eugene Schweig
Himself - United States Geological Survey
?
Richard Stucky
Himself - Denver Museum of Nature & Science