The Doctor meets old friends – and old enemies. But which is which – and who is Who? One thing is sure: they all have a story to tell… 

Three fantastic trips in time and space await the Sixth Doctor (Colin Baker) and Constance Clarke (Miranda Raison) when they return for a brand-new box set of audio adventures, The Cosmos and Mrs Clarke. 

The time travellers visit a forest village with a Dalek (Nicholas Briggs) for a storyteller, reunite with the Doctor’s old acquaintances Marco Polo (Terry Molloy) and Iris Wildthyme (Katy Manning) in thirteenth-century Baghdad, and encounter an unusual creature that duplicates Constance – creating several of her! 

Doctor Who – The Sixth Doctor Adventures: The Cosmos and Mrs Clarke is available to pre-order now from just £19.99 (download to own) or £24.99 (download to own + collector’s edition CD) exclusively here. Please note: the collector’s edition CD box set is strictly limited to 1500 copies and will not be repressed. 

The three thrilling new episodes are: 

The Story Demon by Julian Richards 

The Doctor and Mrs Clarke find themselves on a forest world where human settlers shelter from the night in a village built from wrecked spaceships, living in fear of the Birnamen, creatures who raid their settlement leaving death in their wake. 

But are the Birnamen really to blame? Or does the truth lie with the villagers’ ‘Story Demon’, the hollow travel casing of a very familiar alien creature which they use to entertain their children…? 

The Key to Many Worlds by Paul Magrs 

The Doctor and Constance arrive in thirteenth century Baghdad and encounter an ageing and disenchanted Marco Polo. His adventures at an end, he has been ordered to transport a certain enchantress back to the Doge’s palace in Venice. The Doctor realises his danger too late, as his mind and body are swapped with those of the enchantress – the notorious Iris Wildthyme! 

Now clapped in irons and trapped in Iris’s form, the Doctor is dragged along in Marco’s caravan as it trails across the desert once more... and only Mrs Clarke can save him. 

Inconstancy by Ian Potter 

On the highly regulated colony world of Hoi, the Doctor is captured by the authorities and taken to the forbidden zone for ‘re-education’. Mrs Clarke escapes and discovers an amorphous being in hiding. This protean creature craves purpose and identity, and wants Constance to make it an instrument of her will. Desperate to rescue the Doctor, she agrees – and suddenly Hoi is threatened by a swarm of wild and ravenous Mrs Clarkes! 

Script editor Robert Valentine said: “I’m a huge fan of the Sixth Doctor and Mrs Clarke. Colin Baker and Miranda Raison work beautifully together, and Constance brings out a very particular side of Ol’ Sixie, so the prospect of helping to bring a whole new set of their adventures into the world was extremely enticing. 

“It also meant I got to work with Julian Richards, Ian Potter and Paul Magrs, three writers I greatly admire, and their stories are terrific. There’s a particularly unsettling Dalek story, multiple Mrs Clarkes, and the return of a certain other traveller in space and time whom the Doctor was not expecting to meet again. All in all, you’re in for a cosmically good time.” 

The Key to Many Worlds includes the final performance of actor Anthony Townsend, also known as Antoni Fletcher-Goldspink, a good friend to many at Big Finish, who sadly passed away in 2022. 

Writer Paul Magrs said: “With the casting of Tonio, Marco Polo’s boyfriend, I really lobbied for my late friend Antoni to get the part. Something I never, ever do, but this time I really wanted my friend to get what they'd always wanted – a good part, specially written for them, in a wonderful new Doctor Who story. It's three years since the writing and recording and Antoni is no longer here. I can't wait to hear their voice again.” 

A second Sixth Doctor Adventures box set (Title TBA) will follow later in 2025. Both can be pre-ordered together in a bundle from just £38 (download to own) or £47 (download to own + collector’s edition CD box set). 

Alternatively, listeners can buy this series as part of a bundle of all 15 Classic Doctor Who box sets released in 2025 from just £275 (download to own) or £335 (download to own + collector’s edition CD box set).  

All the above prices (including pre-order and multibuy bundle discounts) are fixed for a limited time only and guaranteed no later than 31 January 2025.

Please note that Big Finish is currently operating a digital-first release schedule. The mail-out of collector’s edition CDs may be delayed due to factors beyond our control, but all purchases of this release unlock a digital copy that can be immediately downloaded or played on the Big Finish app from the release date.