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Series 13 is an ambiguous term on this wiki, since many things could be considered "the thirteenth 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:
- Road Trip (audio anthology), the 2012 box set, which can be viewed as the thirteenth series of Big Finish Productions' Bernice Summerfield
- Jago & Litefoot: Series Thirteen, the 2017 release of Big Finish's Jago & Litefoot
- The First Doctor: Volume Three, the 2019 box set released as the thirteenth series of Big Finish's The Companion Chronicles