They’re the guardians of the Solar System and Earth’s first line of defence. But now the agents of the Space Security Service face their greatest ever threat… 

Anya Kingdom (Jane Slavin) and the android Mark Seven (Joe Sims) are the top agents of the Space Security Service, fighting alien threats and sinister villains across the galaxy. 

Last encountered in the Dalek Universe story arc, in which they teamed up with the Tenth Doctor, these popular characters now star in their own spin-off series of full-cast audio dramas, inspired by the 1960s Doctor Who serials of Terry Nation. 

The thrilling retro-styled adventures of the Space Security Service begin today with a box set of three brand-new stories, which take Anya and Mark to London in the 1980s, a Thal planet where a scientist conducts dangerous experiments, and a world on the brink of war. 

The Worlds of Doctor Who – Space Security Service: The Voord in London is now available to purchase for just £19.99 (as a digital download to own), exclusively here. 

The SSS’s three latest missions are: 

The Voord in London by LR Hay 

1980s London. WDC Ann Kelso is assigned to CID, helping to clean up the streets. But “Ann” is really SSS Agent Anya Kingdom from the 41st century, on a top-secret mission to track down aliens hiding in the past. But then she finds a different group of aliens hiding in the Thames – with very deadly intentions… 

The Thal from G.R.A.C.E. by Felicia Barker 

As their investigations continue, SSS agents Anya Kingdom and Mark Seven journey to a planet colonised by Thals. They’re in pursuit of a Thal scientist who has perfected an experimental new weapon… But soon they are the targets… 

Allegiance by Angus Dunican 

The lush planet Othrys is on the cusp of civil war. SSS agents Anya Kingdom and Mark Seven are meant to keep a low profile while on a diplomatic mission there… But when a pregnant surrogate for the Othryn royal family desperately asks for their help, they’re unable to refuse… 

Joining Jane Slavin and Joe Sims in Space Security Service: The Voord in London are Sean Gilder (Slow Horses), Madeline Appiah (Jungle), and Lara Lemon (Insomnia). The guest cast also includes Rodney Gooden, David Holt, Nicholas Briggs, Camille Burnett, Peter Bankolé, Jez Fielder, and Barnaby Kay. 

Lead actor Joe Sims said: “Being invited back to play Mark Seven again thrills me greatly. There’s unfinished business between Mark and Anya – she is gradually humanising him, both for good and ill, and they’ve got this beautiful relationship where he’s starting to appreciate a little bit of sarcasm. 

“To see his journey, with those humanistic tendencies starting to bubble to the surface, fighting against his own programming, is an absolute delight. And the cliffhanger in episode three is a beauty.” 

Script editor John Dorney added: “There’s something about Terry Nation’s stories where they feel like they all come from the same place. You can put the Space Security Service up against the Voord, and the result is a pretty natural combination, not at all mismatched. We felt the same with Dalek Universe, which is a fully realised, almost TV Comic-style world, bringing in characters like Mark from Nation’s unproduced Dalek pilot, which helped it all come together.” 

Big Finish listeners can save money by pre-ordering The Voord in London with the second volume of Space Security Service (title TBC, due to be released January 2026) in a multibuy bundle for just £38 (download to own), exclusively here. 

All the above prices (including pre-order and multibuy bundle discounts) are fixed for a limited time only and guaranteed no later than 28 February 2026.