The Diary of River Song

The Diary of River Song, also known simply as River Song, was an audio spin-off series produced by Big Finish Productions beginning in 2015. It starred River Song, played by Alex Kingston.

The first series featured Paul McGann as the Eighth Doctor. The second series featured Colin Baker as the Sixth Doctor and Sylvester McCoy as the Seventh Doctor. The third series featured Peter Davison as the Fifth Doctor. The fourth series featured Tom Baker as the Fourth Doctor.

Breaking the previously-established format, series five did not feature the Doctor, but rather the Master. Each story featured a different incarnation of the Time Lord, including the first appearance of Eric Roberts' and Michelle Gomez'  in a Big Finish story.

It was Steven Moffat's idea to make River team up with previous Doctors on these boxsets, so she would work "her way back down his timeline". (VOR 95)

The Eighth of March
The first story of The Eighth of March was a special release for The Diary of River Song.