The Fourth Doctor meets celebrated mathematician and WWII code-breaker, Alan Turing, in a forthcoming full-cast audio drama

In a brand-new Doctor Who adventure, set for release in 2024, the Doctor will meet legendary codebreaker Alan Turing. Foyle’s War actor Anthony Howell plays the famous computer scientist, who has recently been commemorated on the Bank of England £50 note. Turing encounters the new TARDIS team of the Doctor (Tom Baker), Harry Sullivan (Christopher Naylor) and Naomi Cross (Eleanor Crooks). The adventure, entitled Worlds Beyond, appears in Doctor Who – The Fourth Doctor Adventures: Series 13 Volume 1.  The story by Robert Khan and Tom Salinksy joins the previously announced Storm of the Sea Devils by David K Barnes.

Of his performance as Alan Turing, actor Anthony Howell said: “It took a little bit of Internet research on Euclidean geometry and number theory, which was actually quite illuminating. Obviously, I knew about Alan Turing and his huge contribution to this country, and tried to play it as sympathetically as I could.

“There was very little recording of him talking, if at all, so I just went with the text of what Robert and Tom had written and played it appropriately, I hope. It’s a very interesting episode and a lot of fun to do as well.”

Anthony Howell (Alan Turing) and Tom Baker (The Doctor) (c) Paul Midcalf Doctor Who Fourth Doctor Worlds Beyond
Anthony Howell (Alan Turing) and Tom Baker (The Doctor) (c) Paul Midcalf

Worlds Beyond joins a series packed with adventures across space and time

Big Finish Creative Director, Nicholas Briggs said: “Tom Baker started recording Fourth Doctor Adventures with Big Finish in 2011 and he’s still going strong. We’ve now got so many stories in the can we can plan releases right up to 2024, and this series includes some of the strongest and most diverse scripts yet.

“We’ll travel the Earth from the West Indes to West Bengal, and through time and space from an aristocratic manor house to an alien holiday planet. Alongside experienced Doctor Who writers like John Dorney and David K Barnes, we have some of Big Finish’s old hands finally writing their first Fourth Doctor scripts, including Sarah Grochala, Lisa McMullin and Matthew Sweet.

“Plus, it’s great to welcome a newcomer to our Doctor Who ranges with Aurora Fearnley, an experienced science fiction writer, making her debut with Matryoshka, which is as puzzling a story as it sounds.”

Producer David Richardson agreed: “This series is a mix of much-loved familiar elements and brand-new voices. Harry Sullivan is travelling with the Fourth Doctor again. But this time he has a new best friend in the form of Naomi Cross. We have the return of classic monsters, new friends and old enemies.

“Can’t wait until 2024? You can meet Harry and Naomi in UNIT: Nemesis, due out in November 2021. But how UNIT and the Fourth Doctor series are intertwined remains, for now, a mystery to be solved…”


The newly-revealed titles and authors for each story across the trio of thrilling volumes are as follows:

Volume 1

Storm of the Sea Devils by David K Barnes

Worlds Beyond by Robert Khan and Tom Salinsky

Volume 2

Matryoshka by Aurora Fearnley

The Caged Assassin by Matthew Sweet

Metamorphosis by Lisa McMullin

Volume 3

The Face in the Storm by Sarah Grochala

Dominant Species by John Dorney


The three volumes are due for release throughout 2024. Each box set contains brand new full-cast audio adventures for the Doctor, Harry and Naomi. Adventures that will take them across galaxies and empires.

Each volume of Doctor Who – The Fourth Doctor Adventures: Series 13 is available to pre-order individually as a collector’s edition box set (on CD at £19.99 each) and as a digital download (at £16.99 each), exclusively from

Listeners can save money by pre-ordering a bundle of all the collector’s edition boxsets for just £54. Alternatively, they can pre-ordered for £48 as a download.

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. They can also be played on the Big Finish app from the release date.


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