The Third Doctor Adventures: Volume Five

 was a full cast audio anthology released in 2019 by Big Finish Productions.

Publisher's summary
5.1 Primord by John Dorney

Prisoners are escaping from incarceration all around the country and UNIT have been called in to aid in the search. But the Doctor is unwilling to agree to the Brigadier's request for help as he and Jo have opted to take a holiday – they're going to visit his old assistant Liz Shaw, now working in Cambridge University.

But, unfortunately for Jo, the Doctor can't relax for very long. Soon the Time Lord and his friends are facing an old enemy – creatures they'd long since thought they'd put to ground.

The Primords have returned – and this time the danger may strike very close to home.

5.2 The Scream of Ghosts by Guy Adams

When the Brigadier and Jo are called in to look into a breakthrough in the field of portable communication, the Doctor has to stay behind with communications problems of his own – a strange signal coming through the TARDIS console that's burned out its circuits.

When Benton approaches the Doctor with an odd story about an old friend, the Time Lord realises his troubles and the Brigadier's investigations may be connected, and hot-foots it in pursuit.

Soon they discover that terrifying sounds are walking in the woods of the English countryside... but what lurks behind those sounds may be even more dangerous...