The commander of UNIT will join the warrior of the Sevateem, as two of the Doctor’s best friends meet for the first time in The Fourth Doctor Adventures. 

Time travel can always bring complications. The Doctor, Leela and K9 find themselves at different ends of strange temporal effects – from two time zones on the same planet to two locations that couldn’t be more different. But the peril they find in all of these places is the same. 

The Ruins of Kaerula comprises three brand-new episodes starring characters from the Fourth Doctor era circa 1977 – the Doctor (Tom Baker), Leela (Louise Jameson), and K9 (John Leeson). In the box set’s third story, Cry of the Banshee, the TARDIS crew answer a space-time telegraph summons from Brigadier Lethbridge-Stewart (Jon Culshaw). 

With the Doctor’s old comrade in tow, the time travellers set off on an adventure which takes them from a World Peace Conference in Geneva to a space station in the thirtieth century. They have a fearsome Banshee to contend with – but first, Leela and the Brigadier will need to learn to put up with each other! 

Doctor Who – The Fourth Doctor Adventures: The Ruins of Kaerula is now available to pre-order from just £19.99 (download to own) or £24.99 (download to own + collector’s edition 3-disc CD box set), exclusively here. Please note: the collector’s edition CD box set is strictly limited to 1,500 copies and will not be repressed. 

The three brand-new stories are: 

The Remains of Kaerula by Phil Mulryne
The Ruins of Kaerula by Phil Mulryne
Cry of the Banshee by Tim Foley

On bringing the Brigadier into the Fourth Doctor Adventures range, actor Jon Culshaw said: “The Fourth Doctor and Leela’s era had a wonderful gothic quality about it, a Hammer Horror sense, with Leela being a hero – there was never a companion like Leela with that fire of a warrior. 

“With the joys of Big Finish, we have these well-loved characters who didn't meet in the TV programme, but they do now. It's lovely to play the Brigadier with Leela. He would have really admired her warrior spirit.” 

Writer Tim Foley added: “When I was asked to write a story with the Brigadier meeting Leela, I thought it was a very interesting idea to have two very different warriors and soldiers coming together. And then I had the idea to put the Brigadier in space, dislocate him from what he knows – give him a TARDIS adventure, effectively.” 

All three of 2025’s Fourth Doctor Adventures box sets (due for release in March, June and September) can be pre-ordered together in a bundle from just £57 (download to own) or £70.50 (download to own + collector’s edition CD). 

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.