- You may be looking for the Seventh Doctor audio story of the same name.
Vanguard was the first story in the audio anthology, Extinction, produced by Big Finish Productions. It was written by Matt Fitton and featured Jemma Redgrave as Kate Stewart and Ingrid Oliver as Petronella Osgood.
Publisher's summary Edit
From a state-of-the-art bunker beneath the Tower of London, Kate Stewart leads a secret army protecting the Earth from extraterrestrial threat. Crashed UFOs, strange meteors, a giant lizard in the Severn - all business as usual for UNIT.
Journalist Jacqui McGee is also on FutureTech's case, and nothing's going to get in the way of her story: a product launch that will change the world...
to be added
- Kate Stewart - Jemma Redgrave
- Osgood - Ingrid Oliver
- Colonel Shindi - Ramon Tikaram
- Captain Josh Carter - James Joyce
- Simon Devlin - Steve John Shepherd
- Jenna Gold - Karina Fernandez
- Jacqui McGee - Tracy Wiles
- Tim Stevens - Derek Carlyle
- The Nestene Consciousness - Nicholas Briggs
- On 1 June 2017, Big Finish made this first episode of the anthology Extinction available as a separate free download.
- Robotic ravens are being installed at the Tower of London. (TV: The Day of the Doctor)
- Kate wants to replicate the TARDIS language translation capabilities. (TV: The Masque of Mandragora, et al.)
- Osgood mentions the Pharos Project. (TV: Logopolis)
- Osgood has read the UNIT files on the Nestene and Autons. (TV: Spearhead from Space, Terror of the Autons)
- Official Vanguard (free download) page at bigfinish.com
- Official Vanguard - Extinction page at bigfinish.com