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Series 9 is an ambiguous term on this wiki, since many things could be considered "the ninth series" of a particular programme. This page includes things that are explicitly called a "series" or "season", as well as things that are only given a number. It may mean:
- Series 9 (BFBS), the 2008 series of Big Finish Productions' Bernice Summerfield
- The First Doctor: Volume One, the 2015 box set released as the ninth series of Big Finish's The Companion Chronicles
- Jago & Litefoot: Series Nine, the 2015 release of Big Finish's Jago & Litefoot
- Series 9 (4DA), the 2020 series of Big Finish's Fourth Doctor Adventures
- Series 9 (ST), the 2019 series of Big Finish's Short Trips
- Time War: Volume One, the 2018 release which served as the ninth series of Big Finish's Gallifrey series