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
 * Colonel Vikram Shindi - Ramon Tikaram
 * Captain Josh Carter - James Joyce
 * Shana - Vineeta Rishi
 * Sergeant Brundle / Simon / Fisherman / Jasper / Computer / Lift - Roger May
 * Marcus / Evans / Jacob / New Fisherman - Glen McCready
 * Kirsty / Private Sedgwick - Katherine Senior

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)
 * The Skarasen under the lake is mentioned. (AUDIO: The Zygon Who Fell to Earth)
 * Osgood wears a stick of celery to warn her of Praxis gas. (TV: The Caves of Androzani) Josh mentions that it is a change from cat badges. (TV: The Twin Dilemma et al. )
 * Osgood mentions Harry Sullivan's files on the Wirrn. (TV: The Ark in Space)