The Thirteenth Doctor (Jodie Whittaker) and Yaz (Mandip Gill) have travelled to many places and times across the universe, from Sheffield to space via the court of Henry II. But over their last few stops, one name has followed them around – the Tourist. 

In the next episode of The Thirteenth Doctor Adventures, Aegis by Noga Flaishon, the time travellers decide to confront this elusive enemy. To do so won’t be easy – they must infiltrate a convention held by an interplanetary defence contractor, the sinister Aegis Protectorate. 

In this pivotal story, which marks the midpoint of the twelve-episode full-cast audio drama series, the secrets behind the Tourist will be revealed. The Thirteenth Doctor and Yaz’s adventures have been building up to Aegis... 

Doctor Who – The Thirteenth Doctor Adventures: Aegis is now available to pre-order for just £9.99 (as a digital download to own) or £13.99 (download to own + collector’s edition CD), exclusively here. Please note: the collector’s edition CD is strictly limited to 1,500 copies and will not be re-pressed. 

The Doctor and Yaz must infiltrate the Aegis Protectorate interplanetary defence expo in search of someone who has been dogging their travels.  

As the Doctor digs into the company’s main export, the sinister Trojan Program, Yaz faces a battle of her own. Will they finally uncover the truth about the Tourist? 

The Thirteenth Doctor Adventures: Aegis guest stars Juliet Aubrey (Middlemarch, Primeval) as Aegis COO Athena Nikos, as well as Maddison Bulleyment as the Tourist and Shogo Miyakita as Aegis’s deadly mech soldiers. And, Jason Forbes returns as Prospero, the cerebral organoid from previous adventure Ride or Die. 

Writer and producer Noga Flaishon said: “Having read everyone else’s scripts as the producer of this line gave me the chance to build on the work of the other writers and pay off some of the seeds we’ve been planting. I think of Aegis as a ‘mid-season finale’. It's an action-packed sci-fi story which I hope will leave everyone excited for the second half of the series.” 

Aegis is the sixth of twelve full-cast audio drama adventures for the Thirteenth Doctor and Yaz, released bimonthly. Big Finish listeners can save money by pre-ordering all twelve releases in a multibuy bundle for just £102 (digital download to own) exclusively from the Big Finish website. Additional three-release multibuy bundles are available from just £27 (download to own) and £33 (download to own + collector’s edition CD), 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 31 July 2026. 

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.