Revisitations (audio anthology)

 was a full cast audio anthology released on 21 November 2018 by Big Finish Productions, and the seventh release of UNIT: The New Series. It featured Jemma Redgrave as Kate Stewart, Ingrid Oliver as Osgood, James Joyce as Josh Carter, Ramon Tikaram as Vikram Shindi and Pik-Sen Lim as Doctor Chin Lee.

Publisher's summary
7.1 and 7.2 Hosts of the Wirrn by Chris Chapman

After the world’s strangest interview, UNIT’s latest recruit, Shana Siddiqui, hits the ground running to help Osgood with her latest assignment.

left UNIT a parting gift – something alien and deadly. The Wirrn have come to Earth, and now they are free...

Larvae are hatching. Grubs are mutating. The infection is spreading. As a swarm takes to the skies, UNIT struggles to contain its menace.

Kate Stewart meets the danger head-on. To rid the Earth of the Wirrn, she must now confront their Queen.

7.3 Breach of Trust by David K Barnes

An alien vessel arrives on Earth, its occupants seeking refuge, and Osgood takes them in.

But there is reason to mistrust this cry for help. The files show that UNIT has faced the Kalvyri before. What else they reveal will set Kate at odds with her most trusted friends.

7.4 Open the Box by Roy Gill

In the years since the Stangmoor Prison incident, Captain Chin Lee found a new calling. She now heads up an international organisation, dedicated to meditation and 'mental fortitude' training.

But there is a menace deep inside the Pandora Institute. And Kate, Osgood and Josh must face their darkest fears...