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| Aflevering | Eerste uitzending |
|---|---|
| S04E01 - Poisoned Snow | 11/09/1975 |
| S04E02 - The Glass Dart Board | 18/09/1975 |
| S04E03 - No Place to Hide | 25/09/1975 |
| S04E04 - Men Will Die | 02/10/1975 |
| S04E05 - School of Fear | 09/10/1975 |
| S04E06 - Deadly Silence | 16/10/1975 |
| S04E07 - Murder by Proxy | 23/10/1975 |
| S04E08 - Trail of Terror | 30/10/1975 |
| S04E09 - Web of Lies | 06/11/1975 |
| S04E10 - Dead Air | 13/11/1975 |
| S04E11 - Merchants of Death | 20/11/1975 |
| S04E12 - The Cat's Paw | 04/12/1975 |
| S04E13 - Spooks for Sale | 11/12/1975 |
| S04E14 - Most Likely to Succeed | 18/12/1975 |
| S04E15 - Police Buff | 08/01/1976 |
| S04E16 - The Honorable Profession | 15/01/1976 |
| S04E17 - Requiem for Murder | 22/01/1976 |
| S04E18 - Underground | 29/01/1976 |
| S04E19 - Judgment Day | 19/02/1976 |
| S04E20 - Clown of Death | 26/02/1976 |
| S04E21 - Superstar | 04/03/1976 |
| S04E22 - Alien Country | 11/03/1976 |
| S04E23 - Runaway | 18/03/1976 |