| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S00E01 |
Pilot
|
December 31, 2013
BBC Two
|
56 | |
| S00E02 |
2017 Christmas Special
critical to story
|
December 26, 2017
BBC Two
|
29 | |
| S00E03 |
2020 Christmas Special
critical to story
|
December 28, 2020
BBC Two
|
30 | |
| S00E04 |
2021 Christmas Special
critical to story
|
December 20, 2021
BBC Two
|
28 | |
| S00E05 |
2022 Christmas Special
season finale
critical to story
|
December 23, 2022
BBC Two
|
29 |
No artwork of this type.
No artwork of this type.
No artwork of this type.