| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Episode 1 |
September 21, 1974
BBC One
|
60 | |
| S04E02 | Episode 2 |
September 28, 1974
BBC One
|
60 | |
| S04E03 | Episode 3 |
October 5, 1974
BBC One
|
60 | |
| S04E04 | Episode 4 |
October 12, 1974
BBC One
|
60 | |
| S04E05 | Episode 5 |
October 19, 1974
BBC One
|
60 | |
| S04E06 | Episode 6 |
October 26, 1974
BBC One
|
60 | |
| S04E07 | Episode 7 |
November 2, 1974
BBC One
|
60 | |
| S04E08 | Episode 8 |
November 9, 1974
BBC One
|
60 | |
| S04E09 | Episode 9 |
November 16, 1974
BBC One
|
60 | |
| S04E10 | Episode 10 |
November 23, 1974
BBC One
|
60 | |
| S04E11 | Episode 11 |
November 30, 1974
BBC One
|
60 | |
| S04E12 | Episode 12 |
December 7, 1974
BBC One
|
60 | |
| S04E13 | Episode 13 |
December 14, 1974
BBC One
|
60 | |
| S04E14 | Episode 14 |
December 21, 1974
BBC One
|
60 | |
| S04E15 | 1974 Christmas Special |
December 25, 1974
BBC One
|
60 | |
| S04E16 | Episode 16 |
January 4, 1975
BBC One
|
60 | |
| S04E17 | Episode 17 |
January 11, 1975
BBC One
|
60 | |
| S04E18 | Episode 18 |
January 18, 1975
BBC One
|
60 | |
| S04E19 | Episode 19 |
January 25, 1975
BBC One
|
50 | |
| S04E20 |
Episode 20
season finale
|
February 1, 1975
BBC One
|
60 |
No artwork of this type.
No artwork of this type.