This episode is set 35,000 years ago and depicts Homo sapiens's encounter with Homo neanderthalensis. As the ice caps retreated, the Neanderthal stronghold in Europe weakened, providing a window of opportunity to which modern humans owe their existence.
| Name | Type | Role | |
|---|---|---|---|
| Colin Swash | Writer | ||
| Matt Ridley | Guest Star | ||
| Matthew Rook | Guest Star | ||
| Jimmy Akingbola | Guest Star | ||
| Geraldine James | Guest Star | ||
| Justin Strydom | Guest Star | ||
| Gary Carr | Guest Star | ||
| Ray Fearon | Guest Star | ||
| Chris Stringer | Guest Star | ||
| Sean Francis | Guest Star | ||
| Sacha Jones | Guest Star | ||
| John Shea | Guest Star | ||
| Rebecca Scroggs | Guest Star | ||
| David Stewart | Director |