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
to be added

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)