Hosts of the Wirrn (audio story)

 was the first story in the audio anthology, Revisitations, produced by Big Finish Productions. It was written by Chris Chapman and featured Jemma Redgrave as Kate Stewart and Ingrid Oliver as Petronella Osgood.

Publisher's summary
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.

Plot
to be added

Cast

 * Kate Stewart - Jemma Redgrave
 * Osgood - Ingrid Oliver
 * Josh Carter - James Joyce
 * Colonel Shindi - Ramon Tikaram
 * Shana Siddiqui - Vineeta Rishi
 * Sergeant Brundle / Simon / Fisherman / Jasper - Roger May

Continuity

 * left UNIT a Wirrn egg as a parting gift. (AUDIO: Master of Worlds)
 * The Well contains strains of the Silurian plague and the Green Death. (TV: Doctor Who and the Silurians, The Green Death)