Stories Audio Drama The Sixth Doctor Adventures The Key to Many Worlds 1 image Overview Characters How to Listen Quotes Overview Releasing sometime in May 2025 Written by Paul Magrs Cover Art by Sean Longmore Publisher Big Finish Productions Directed by Samuel Clemens Time Travel Past Tropes (Potential Spoilers!) Body swap Location (Potential Spoilers!) Baghdad Synopsis 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 is swapped with that 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. Skip Skipped Unowned Owned Owned Save to my list Saved Edit date completed Custom Date Release Date Archive (no date) Save Characters Sixth Doctor Colin Baker Constance Clarke Miranda Raison Marco Polo Iris Wildthyme Katy Manning Show All Characters (4) How to listen to The Key to Many Worlds: Big Finish Audio The Sixth Doctor Adventures: The Cosmos and Mrs Clarke Quotes Add Quote Submit a Quote