| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S01E01 | The Visitors |
May 12, 1968
BBC One
|
25 | |
| S01E02 | The Coalminers |
May 19, 1968
BBC One
|
25 | |
| S01E03 | The Message |
May 26, 1968
BBC One
|
25 | |
| S01E04 | The Foreign Gentleman |
June 2, 1968
BBC One
|
25 | |
| S01E05 | The Secret |
June 9, 1968
BBC One
|
25 | |
| S01E06 | The Rescue |
June 16, 1968
BBC One
|
25 | |
| S01E07 |
The Meeting
series finale
|
June 23, 1968
BBC One
|
25 |
No artwork of this type.
No artwork of this type.
No artwork of this type.