The Auton Infinity (audio story)

 was the only story in the audio anthology Forty: Volume 2. It was written by Tim Foley and featured Peter Davison as the Fifth Doctor, Janet Fielding as Tegan Jovanka, Mark Strickson as Turlough and Jon Culshaw as Kamelion, Brigadier Lethbridge-Stewart and.

Publisher's summary
Snowdonia. UNIT is running a training exercise with the Brigadier in attendance. Except it isn’t long before things start to go badly wrong. The fake aliens primed to attack the troops might not be so fake after all, and a temporal disturbance attracts the Doctor, Tegan and Turlough into the fray.

Old enemies are on the scene with a deadly plan - but they might be the least of the Doctor’s worries.

Because he’s recently been sent backwards and forwards through his own lifetime...and he’s finally going to find out why.

Plot
to be added

Cast

 * The Doctor - Peter Davison
 * Tegan Jovanka - Janet Fielding
 * Turlough - Mark Strickson
 * Kamelion / Brigadier Lethbridge-Stewart / - Jon Culshaw
 * Prodigal - Juliet Aubrey
 * Veronica Holmes - Lucy Fleming
 * Captain Ted Mears - Oscar Pearce
 * Sergeant Janet Wharry - Fiona Hampton
 * Corporal Vikram Plamer - Homer Todiwala
 * Dobson / The Autons - Glen McCready

Continuity

 * The Brigadier has still officially retired from UNIT. (TV: Mawdryn Undead, The Five Doctors, Battlefield)
 * The TARDIS is still being drawn to the middle of the universe. (TV: Frontios)
 * The Brigadier refers to Charles Crichton. (TV: The Five Doctors)
 * The Doctor refers to the Gravis. (TV: Frontios)
 * Tegan believes the Doctor is still missing the Sonic Screwdriver. (TV: The Visitation)
 * UNIT had previously served as security for peace conferences in TV: The Mind of Evil and Day of the Daleks.
 * Turlough is embarrassed about the idea of driving in the Brigadier's presence. (TV: Mawdryn Undead)
 * The Doctor reminds Turlough that the Brigadier taught him at Brendon Public School. (TV: Mawdryn Undead)
 * Captain Mears refers to London being invaded by the Yeti (TV: The Web of Fear), dinosaurs (TV: Invasion of the Dinsaurs) and the Loch Ness Monster. (TV: Terror of the Zygons)
 * The Master previously formed an alliance with the Autons in TV: Terror of the Autons.