| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Theory |
September 12, 1968
BBC One
|
50 | |
| S04E02 | Proof |
September 19, 1968
BBC One
|
50 | |
| S04E03 | Bird Of Passage |
September 26, 1968
BBC One
|
50 | |
| S04E04 | See The Rabbit |
October 3, 1968
BBC One
|
50 | |
| S04E05 | Take Them In Singles |
October 10, 1968
BBC One
|
50 | |
| S04E06 | Red Herring |
October 17, 1968
BBC One
|
50 | |
| S04E07 | Five Pairs O' Hands |
October 24, 1968
BBC One
|
50 | |
| S04E08 | Minor Incident |
October 31, 1968
BBC One
|
50 | |
| S04E09 | An Old Song |
November 7, 1968
BBC One
|
50 | |
| S04E10 | Big Boats, Little Boats |
November 14, 1968
BBC One
|
50 | |
| S04E11 | For A Rainy Day |
November 21, 1968
BBC One
|
50 | |
| S04E12 | Assistance |
November 28, 1968
BBC One
|
50 | |
| S04E13 | Equal Status |
December 5, 1968
BBC One
|
50 | |
| S04E14 | Obstruction |
December 12, 1968
BBC One
|
50 | |
| S04E15 | Going Quietly |
December 19, 1968
BBC One
|
50 | |
| S04E16 | On Christmas Day In The Morning |
December 27, 1968
BBC One
|
50 | |
| S04E17 | Departure |
January 2, 1969
BBC One
|
50 | |
| S04E18 | Cross Reference |
January 9, 1969
BBC One
|
50 | |
| S04E19 | Run For The Hills |
January 16, 1969
BBC One
|
50 | |
| S04E20 | Pressure |
January 23, 1969
BBC One
|
50 | |
| S04E21 | A Quantity Of Gelignite |
January 30, 1969
BBC One
|
50 | |
| S04E22 | Critical Path |
February 6, 1969
BBC One
|
50 | |
| S04E23 | Persistence |
February 13, 1969
BBC One
|
50 | |
| S04E24 | Second Chance |
February 20, 1969
BBC One
|
50 | |
| S04E25 | How's The Wife Then ? |
February 27, 1969
BBC One
|
50 | |
| S04E26 | Right To Search |
March 6, 1969
BBC One
|
50 | |
| S04E27 |
Proved Connection
season finale
|
March 13, 1969
BBC One
|
50 |
No artwork of this type.
No artwork of this type.
No artwork of this type.