Production
| Episode | Broadcast date | Run time | Viewership |
Archive |
|---|---|---|---|---|
| "The Sea of Death" | 11 April 1964 (1964-04-11) | 23:20 | 9.9 | 16mm t/r |
| "The Velvet Web" | 18 April 1964 (1964-04-18) | 25:37 | 9.4 | 16mm t/r |
| "The Screaming Jungle" | 25 April 1964 (1964-04-25) | 23:45 | 9.9 | 16mm t/r |
| "The Snows of Terror" | 2 May 1964 (1964-05-02) | 24:54 | 10.4 | 16mm t/r |
| "Sentence of Death" | 9 May 1964 (1964-05-09) | 25:03 | 7.9 | 16mm t/r |
| "The Keys of Marinus" | 16 May 1964 (1964-05-16) | 25:11 | 6.9 | 16mm t/r |
This story was written to replace a different script, The Hidden Planet, which was deemed problematic. Because the replacement script had to be written quickly, it was decided to base it around a series of largely self-contained episodes, each with a different setting and cast, to make it easier to write in a short time.
Model filming for The Keys of Marinus commenced in March 1964 at Ealing at Ealing Studios, with the rest of the studio recording done in March and April at Lime Grove Studios. The tank-top Susan wears was knitted by Carole Ann Ford's mother. Ford has expressed displeasure with the portrayal of Susan in the serial, calling her character "pathetic".
Read more about this topic: The Keys Of Marinus
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