Invocation (audio story)

 was the second story in the audio anthology, Encounters, produced by Big Finish Productions. It was written by Roy Gill and featured Jemma Redgrave as Kate Stewart, Ingrid Oliver as Petronella Osgood, James Joyce as Josh Carter and Ramon Tikaram as Vikram Shindi.

Publisher's summary
It's Hallowe'en, and Josh finds himself at a party where phantoms are becoming all too real. Osgood is working late and hears a voice from the skies making strange incantations. The next day, Kate has gone missing in the Scottish Borders, and the team head north to investigate. Ghosts from the past are haunting UNIT, and now they threaten the whole world…

Plot
On Hallowe'en, Kate goes to Scotland to find out why UNIT has held onto former research facility Ealdon House and to ensure that nothing has been left behind. The caretaker, Mrs Donelly, gives her a tour and she realises that she came to the house with the Brigadier as a girl and that she and Ben had a rhyme about a Grey Man. She looks around the house at night and, in the gallery, sees him approach her with his long fingers.

Osgood stays late at UNIT HQ with Corporal James Morley and picks up a transmission from a 1960s satellite which should have run out of power long ago. Originally in English, it changes to an archaic Latin invocation of a spirit. The next day, Josh tells her about how everybody at Phoebe's Hallowe'en party saw a Grey Man that he could not and Osgood finds that Phoebe's house used to be a television station. The two of them fly to Ealdon House after Kate fails to check in and, on the way, Osgood finds that some of the information on the research there is missing.

Kate learns that Mrs Donelly served in the British Army, but she avoids any and all questions put to her about it, and has Shindi ready to evacuate the area around Phoebe's house if there is further activity. Osgood becomes suspicious of Ben upon learning that he works in computer forensics, meaning that he likely has the skills to remove the data from UNIT's system, and later sees the Grey Man. She realises that Josh cannot see it because of the plastic skeleton that the Nestenes left him with. He smashes a window to change the resonance and get rid of the Grey Man.

to be completed

Cast

 * Kate Stewart - Jemma Redgrave
 * Osgood - Ingrid Oliver
 * Captain Josh Carter - James Joyce
 * Colonel Shindi - Ramon Tikaram
 * Phoebe Breckenridge - Karina Fernandez
 * Alice Donelly - Lucy Fleming
 * Ben Donelly - Matthew Cottle
 * Corporal James Morley - David Jonsson
 * Satellite Voice - Barnaby Edwards

Continuity

 * Josh cannot see the ghosts due to his Auton physiology. (AUDIO: Bridgehead, Armageddon)