In a race against developers in the Rocky Mountains, paleontologists uncover a unique fossil site packed with astonishingly well-preserved bones of mammoths, mastodons, and other giant extinct beasts. The discovery opens a highly focused window on the vanished world of the Ice Age in North America.
| Actor | Role |
|---|---|
 Lance LewmanNarrator | Narrator |
 Kirk JohnsonHimself - Denver Museum of Nature & Science | Himself - Denver Museum of Nature & Science |
| DDaniel FisherHimself - University of Michigan | Himself - University of Michigan |
| IIan MillerHimself - Denver Museum of Nature & Science | Himself - Denver Museum of Nature & Science |
| JJoseph SertichHimself - Vertebrate Paleontologist | Himself - Vertebrate Paleontologist |
| EEugene SchweigHimself - United States Geological Survey | Himself - United States Geological Survey |
| RRichard StuckyHimself - Denver Museum of Nature & Science | Himself - Denver Museum of Nature & Science |