Old Soldiers (audio drama)

Old Soldiers is a Big Finish Productions audiobook based on the long-running British science fiction television series "Doctor Who".
The Companion Chronicles "talking books" are each narrated by one of the Doctor's companions and feature a second, guest-star voice along with music and sound effects. It features Nicholas Courtney as Brigadier Lethbridge-Stewart
Plot.
Brigadier Lethbridge-Stewart reminisces about an adventure with the Third Doctor in which they fought a seemingly undefeatable enemy.