| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S05E01 | Secrets from a Frozen World |
September 29, 1991
|
60 | |
| S05E02 | Prisoners of the Brain |
December 1, 1991
|
60 | |
| S05E03 | Insects: The Ruling Class |
April 8, 1992
|
60 | |
| S05E04 | The Dawn of Humankind |
May 6, 1992
|
60 |
No artwork of this type.
No artwork of this type.
No artwork of this type.