[1] Originally announced in 2015 as The Diary of River Song, the audio series is one of the first from Big Finish Productions to prominently feature elements from the revived era of Doctor Who (2005–).
The character of River Song was introduced in the fourth series episode "Silence in the Library" (2008) with the Tenth Doctor as a mysterious figure from his future.
In the first boxset story, The Rulers of the Universe, River cross paths with the Eighth Doctor, a still younger incarnation.
[2][3] The third series, announced September 2017, features an encounter with the Fifth Doctor with Frances Barber reprising her role of Madame Kovarian.
[7][8] Big Finish subsequently renewed The Diary of River Song in October 2018, for a further two more series (the sixth and seventh) to be released in 2019 and 2020.