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
to be added