| Name | First Aired | Runtime | Image | Certified | |
|---|---|---|---|---|---|
| S04E01 | What Will Survive (1) |
March 4, 2015
ITV
|
45 | ||
| S04E02 | What Will Survive (2) |
March 11, 2015
ITV
|
45 | ||
| S04E03 | Buried (1) |
March 18, 2015
ITV
|
45 | ||
| S04E04 | Buried (2) |
March 25, 2015
ITV
|
45 | ||
| S04E05 | Ghosts (1) |
April 1, 2015
ITV
|
45 | ||
| S04E06 | Ghosts (2) |
April 8, 2015
ITV
|
45 |
