
was created and scripted by Booker Prize
nominee, and Emmy award winner Neil
- Varma reprised Suzie Costello, her Torchwood role, for Big Finish, and was cast as the Duchess for Series 14
- Warren [Martin] Brown (DS Justin Ripley) voiced Stephen Gibson for Industrial Evolution, Johnny Skipton for Dead Men's Tales (both 2011), Rufus Stone/To'Koth for Signs and Wonders (2014), Lieutenant Sam Bishop for UNIT: Extinction (2015), UNIT: Shutdown, UNIT: Silenced (both 2016), UNIT: Assembled (2017), UNIT: Cyber Reality, Lady Christina 1 (both 2018), UNIT: Incursions (2019), Lady Christina 2 (2021), Way of the Burryman and The Forth Generation (both 2022), then was Jake Willis in Praxeus
- Reeves voiced Carmen Rega for Emissary of the Daleks (2019), then was Maddelena Fagandini and Mary Wollstonecraft in Delia: The Myths and Legendary Tapes
- Steven Mackintosh (DCI Reed) was Gazak in Timelash
- Michael Smiley (Benny Silver) was Colonel Morgan Blue in Into the Dalek, and voiced Seedleson for Creatures of Beauty (2003)
- Sam Spruell (Lynch) was Swarm in Flux
- Diveen Henry (PC Hanson) voiced Alozza for The Vault of Osiris (2015), Sarah for The Behemoth, Sandra for A Kill to a View (both 2017), and Amanda for Ashenden (2021)
- Sean Pertwee (Lynch) made a cameo appearance in The Five(ish) Doctors
- Paul Rhys (Burgess) voiced Max Paul for The Scapegoat (2009)
- stunt co-ordinator Derek Lea was a stuntman on Dalek, Bad Wolf, The Parting of the Ways, The Age of Steel and Partners in Crime
- Stephanie Carey was also a stunt performer on ten stories (from Voyage of the Damned to The Vanquishers)
- Andrew Tiernan (Henley) was [Jim] Purcell in Night Terrors
- Rob Jarvis (Shand) was Abramal in The Time of the Doctor
- Graham Turner (Holguin) was Amos in The Crimson Horror
- Okorie Chukwu (PC Fulford) voiced Mike/Cyborg Auditor/Henry for Her Own Worst Enemy (2021)
- Jozef Aoki (Spectator) voiced Toda Elji/Yoshita Hiroshi for The Barbarians and the Samurai (2018)
- director Stefan Schwartz played the Knight Commander in Battlefield
- Neal Champion was the SFX supervisor on An Adventure in Space and Time too
- series stand-by art director Adrian Greenwood was the production buyer on twelve installments, from Asylum of the Daleks to The Name of the Doctor
- Nick Foley was ADR mixer on The Snowmen too
- series production buyer Pauline Seager was the assistant floor manager (AFM) on The Five Doctors
- Elliott Gilhooly was sound assistant on part two of The End of Time too