The Avenues of Possibility was the fifth story in the audio anthology The Legacy of Time, produced by Big Finish Productions. It was written by Jonathan Morris and featured Colin Baker as the Sixth Doctor, India Fisher as Charlotte Pollard and Anna Hope as DI Patricia Menzies.
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.
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- The Doctor - Colin Baker
- Charley Pollard - India Fisher
- DI Patricia Menzies - Anna Hope
- Henry Fielding - Duncan Wisbey
- John Fielding - Richard Hansell
- Wadmore - Delroy Atkinson
- Stables / Siren / Mary - Sara Poyzer
- The adventure where the Doctor met Henry involved an exiled Draconian Prince.
- The Fielding brothers initially met the First Doctor while he was travelling with Dodo Chaplet, but met him again more recently in his current incarnation when he was travelling with Peri Brown.
- In the alternative 1950s, the Unified Kingdom is ruled by William VI.
- This episode was to feature the return of Jago and Litefoot, but this was dropped following the death of Trevor Baxter. (BFX: The Legacy of Time)
- The Chronovores were also due to return, but were dropped in pre-production. (BFX: The Legacy of Time)
- While draining the Doctor of temporal energy, the Sirens tell Charley they are not going to kill him. They need him alive, so that he could create a greater time paradox, one which "would consume the Time Lords". (AUDIO: The Sirens of Time)
- Charley met Menzies a few weeks ago. (AUDIO: The Condemned)
- Charley tells the Doctor of her travels with his future incarnation; that she was rescued from the R101, (AUDIO: Storm Warning) met Orson Welles, (AUDIO: Invaders from Mars) William Shakespeare and the Daleks, (AUDIO: The Time of the Daleks) that Edward Grove is alive, (AUDIO: The Chimes of Midnight) to embrace the darkness, (AUDIO: Embrace the Darkness) that Zagreus exists, (AUDIO: Zagreus) that they travelled to a Divergent Universe, (AUDIO: Scherzo) that they met a lizard named C'rizz, (AUDIO: The Creed of the Kromon) and that she knows all about Samson and Gemma. (AUDIO: Terror Firma)
- Having been almost exhausted by the Sirens of Time and recovering from being knocked out, the Doctor mentions Commander Radnor and piloting a rocket to the Moon. (TV: The Seeds of Death)