A study of heredity in man, showing how both good and bad characteristics are passed on from one generation to the next.
| Actor | Role |
|---|---|
| JJulian HuxleySelf - Narrator | Self - Narrator |
| EEdward CarrickSelf | Self |
 Edith CraigSelf | Self |
 John GielgudSelf | Self |
| DDan GodfreySelf | Self |
| HHoward GodfreySelf | Self |
| HHazel TerrySelf | Self |