- Script Editor: Terrance Dicks;
- Writer: Malcolm Hulke;
- Produced by: Barry Letts;
- Director: Timothy Combe;
- Designer: Barry Newbery;
- Incidental Music: Carey Blyton;
- Brigadier Lethbridge-Stewart: Nicholas Courtney;
- Liz Shaw: Caroline John;
| Channel | Episode | Title | Date | Viewers | Position |
| BBC 1 |
258 |
Episode One |
Sat 31 Jan 1970 |
3117:15 - 17:40 |
8.8M |
41st |
| BBC 1 |
259 |
Episode Two |
Sat 7 Feb 1970 |
717:15 - 17:40 |
7.3M |
68th |
| BBC 1 |
260 |
Episode Three |
Sat 14 Feb 1970 |
1417:15 - 17:40 |
7.5M |
60th |
| BBC 1 |
261 |
Episode Four |
Sat 21 Feb 1970 |
2117:15 - 17:40 |
8.2M |
46th |
| BBC 1 |
262 |
Episode Five |
Sat 28 Feb 1970 |
2817:15 - 17:40 |
7.5M |
52nd |
| BBC 1 |
263 |
Episode Six |
Sat 7 Mar 1970 |
717:15 - 17:40 |
7.3M |
63rd |
| BBC 1 |
564 |
Episode Seven |
Sat 14 Mar 1970 |
1417:15 - 17:40 |
7.5M |
54th |
- Marylebone Station, London;
- Hankley Common;
- Milford Chest Hospital, Goldaming, Surrey;
- Transmitter Station, Hog's Back, Surrey;
- Television Centre Studio 1;
- Television Centre Studio 3;
- Television Centre Studio 8;
|