The Third Doctor Adventures: Volume Six

 was a full cast audio anthology released on 14 May 2020 by Big Finish Productions. It was the sixth release of The Third Doctor Adventures. It featured Tim Treloar as the Third Doctor, Katy Manning as Jo Grant, Jon Culshaw as Brigadier Lethbridge-Stewart, John Levene as Sergeant Benton and Ian McNeice as Winston Churchill.

Publisher's summary
Two brand new adventures for the Third Doctor.

6.1 Poison of the Daleks by Guy Adams

UNIT has been seconded to handle security at Breathe Industries' revolutionary new air filtration plant. The Doctor is initially dismissive... but when a man seems to appear out of thin air and die, his curiosity is piqued.

The Doctor soon discovers that the plant is connected to another time, another place. Stranded with Jo, the Brigadier and Benton on a distant planet, the Doctor discovers the terrible truth behind Breathe Industries' new technology. His oldest enemies, the Daleks.

Can even the Doctor and UNIT manage to save two worlds at the same time?

6.2 Operation: Hellfire by Jonathan Barnes

When the Doctor accepts an invitation to an audience with a popular horror writer, he's expecting a rather dull evening. But he quickly senses the presence of another Gallifreyan nearby. The Time Lords have a mission for him.

Soon the Doctor and Jo and themselves at the height of the Second World War in 1943. Caught up in a struggle involving occultist Nazis, the Prime Minister, top secret agencies and a mysteriously powerful amulet, they must distinguish friend from foe and avoid sacrifice upon the altar of evil.

Featured actors

 * Tim Treloar
 * Katy Manning
 * John Levene
 * Jon Culshaw