United was the fourth and final story in the audio anthology, Assembled, produced by Big Finish Productions. It was written by Matt Fitton and featured Jemma Redgrave as Kate Stewart and Ingrid Oliver as Petronella Osgood.
to be added
- Kate Stewart - Jemma Redgrave
- Osgood - Ingrid Oliver
- Sam Bishop - Warren Brown
- Josh Carter - James Joyce
- Jo Jones - Katy Manning
- Mike Yates - Richard Franklin
- John Benton - John Levene
- Jastrok - Richard Hope
- Kalana - Neve McIntosh
- Osgood uses a Sontaran transmat device.
- When describing the siege of Britain, General Winifred Bambera is said to be in Peru, Alan Mace in Japan, and Colonel Shindi and Elizabeth Klein in Geneva.
- The Silurian steeds devoured London Zoo en route to Westminster.
- The Anthropocene era is a human-dominated era.
to be added
- Yates and Benton remember the last time dinosaurs walked down Lewisham. (TV: Invasion of the Dinosaurs)
- Yates recalls the Silurians' attempt to wipe humanity with a plague. (TV: Doctor Who and the Silurians)
- Jo refers to Santiago Jones keeping her up with all the latest technology. (TV: Death of the Doctor)
- Benton uses the command "Chap with wings there, five round rapid". (TV: The Dæmons)
- Jastrok bemoans Eldane, (TV: Cold Blood) Icthar and the Triads. (TV: Warriors of the Deep)