| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Decoding Disaster |
July 13, 2017
BBC Four
|
60 | |
| S04E02 | The Vikings: Foe Or Friend? |
July 18, 2017
BBC Four
|
60 | |
| S04E03 | Dictators And Despots |
July 25, 2017
BBC Four
|
60 | |
| S04E04 |
Explorers: Conquest and Calamity
series finale
|
August 1, 2017
BBC Four
|
60 |
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No artwork of this type.
No artwork of this type.