5. The Avenues of Possibility

The Legacy of Time
An epic six-part adventure celebrating 20 years of Doctor Who at Big Finish!

Time is collapsing. Incidents of chaos and devastation are appearing throughout the lives of one Time Lord and his many friends - all fallout from one terrible disaster. From Earth's past and present to timeless alien worlds, from the cloisters of Gallifrey into the Vortex itself ... The Doctor must save universal history - and he needs all the help he can get.

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5. The Avenues of Possibility by Jonathan Morris

DI Patricia Menzies is used to the strange, but even she is surprised when the eighteenth century itself falls onto her patch. Fortunately, she has the founders of modern policing to help with her enquiries. And when the Sixth Doctor and Charley arrive, they find armed and hostile forces trying to change Earth history forever.

32 out of 42 (76.2%) raters say this story requires a previous story.