Production
| Episode | Broadcast date | Run time | Viewership |
Archive |
|---|---|---|---|---|
| "Invasion Part One" | 12 January 1974 (1974-01-12) | 25:29 | 11.0 | Chroma dot colour recovery |
| "Part Two" | 19 January 1974 (1974-01-19) | 24:43 | 10.1 | PAL 2" colour videotape |
| "Part Three" | 26 January 1974 (1974-01-26) | 23:26 | 11.0 | PAL 2" colour videotape |
| "Part Four" | 2 February 1974 (1974-02-02) | 23:33 | 9.0 | PAL 2" colour videotape |
| "Part Five" | 9 February 1974 (1974-02-09) | 24:30 | 9.0 | PAL 2" colour videotape |
| "Part Six" | 16 February 1974 (1974-02-16) | 25:34 | 7.5 | PAL 2" colour videotape |
Working titles for this story included Bridgehead from Space and Timescoop. The story title of the first episode was contracted to Invasion in the opening title sequence, in an attempt to conceal the central plot device of dinosaurs. However, this was undermined by the BBC listings magazine Radio Times, which gave the full title. Confusion of this episode with the identically-named 1968 serial 'Invasion', in BBC documentation, was long thought to have led to the 1974 episode being wiped in error. Malcolm Hulke protested against the use of the title Invasion of the Dinosaurs, preferring the original working title of Timescoop, and felt the contraction for the first episode was silly, especially because the Radio Times listing used the full title. In a response letter after transmission script editor Terrance Dicks pointed out that all the titles used for the project had originated in the Doctor Who production office. He agreed that the contraction to Invasion was a decision he now regretted but noted that "Radio Times are a law unto themselves".
In the novelisation, adapted by Malcolm Hulke from his own scripts, no reference is made to the "Whomobile" (which was a prop contributed to the production at a late stage by actor Jon Pertwee). In the novel, the Doctor uses a military motorbike with electronic scanning equipment attached, as in the original scripts.
Locations used in London included: Westminster Bridge, Whitehall, Trafalgar Square, Haymarket, Covent Garden, Southall and Wimbledon Common
Read more about this topic: Invasion Of The Dinosaurs
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