15B. Doctor Who: The Fourth Doctor Adventures Series 15: Lethal Progress

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Doctor Who - The Fourth Doctor Adventures

Released June 2026

Written by Lizzie Hopley Tim Foley John Dorney

Starring Tom Baker Sadie Miller

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This title was released in June 2026. It will be exclusively available to buy from the Big Finish website until 31 July 2026, and on general sale after this date.

The Doctor takes the TARDIS into the future where many great scientific leaps are taking place. But every new advance has its risks - and some of these risks are deadlier than others.

15.3 Green and Pleasant Planet by Tim Foley
The Doctor and Sarah find themselves exploring an alien world alongside a British space expedition. It's never been visited before... so what's a model village doing on the surface of the planet?

Finding the answer may prove deadly.

15.4 The Continuum by John Dorney
The Doctor and Sarah land on the space-station Daedalus on the day it makes history. The first journey through hyperspace has just been completed. But it hasn't gone as smoothly as posterity suggests.

Something terrible is happening - and the clock is ticking down.

15.5 The Audience by Lizzie Hopley
A cultural festival on Gakoria should be light relief for the TARDIS crew. But when one of the cast of a play dies, Sarah has to join the troupe.

And the Audience on this world are very demanding. Because on this planet... the play's the thing.

**Please note: the collector's edition CD box set is strictly limited to 1,500 copies**

Recorded on: 19 April, 17 May and 14 June 2021

Recorded at: recorded remotely

Producer David Richardson said: "The Doctor and Sarah Jane head out among the stars... and they’re indomitable! After the cosily Earth-bound Ministry of Death, the travellers visit other worlds and other times in Lethal Progress, which, as the title might suggest, finds that scientific advancement doesn’t always benefit the human race. Expect three imaginative and thrilling adventures from the minds of the brilliant Tim Foley, John Dorney and Lizzie Hopley!"

Writer John Dorney explained his episode: "I came into this story wanting to write something with a bit of horror but in a science fiction way. I was looking at different fictions for inspiration, like The Great God Pan and Event Horizon. Then I began to think about doing the whole thing as one long continuous scene; we've had a few ‘single take’ films like that in recent years, and I was curious to see what that would bring to a Doctor Who story."

And, the third episode’s writer Lizzie Hopley said: "Everyone says write what you know, so with this story, as I started off as an actress, I wanted to write something about that process in an alien environment. I've had some nightmare audiences, so this is basically a nightmare. I had to tone down the horror!"

Sadie Miller, who plays the Doctor’s companion Sarah Jane Smith, said of the three episodes: "Green and Pleasant Planet has a very Jonathan Swift feel, and there’s something quintessentially British about it. It's a very layered story, and the more you listen to it, you pick up notes of William Blake in there as well. I think it’s a real classic in the making.

"The Continuum takes place in real time, so you’re immersed in this experience, you have that very modern energy. But it's still a traditional Doctor Who story, with a John Carpenter element of horror meets sci-fi, so it's very spooky, very exciting.

"I thought that the script for The Audience was very interesting," Miller continued, "very theatrical, obviously, and there's quite a lot in it that's evocative of a play like Hamlet. There are so many moments of breaking the fourth wall in a number of different senses, which was really interesting."