Power Cell (audio story)

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

Publisher's summary
Osgood and Captain Josh Carter are sent to investigate the disappearance of a UNIT scientist.

Meanwhile, alien technology has fallen into the hands of Lyme Industries, and Kate Stewart can't persuade the company's CEO, Felicity Lyme, to give it back.

But UNIT find themselves fighting a third battle when innocent people start to die. Who are the mysterious assassins? And what does Felicity Lyme want with top secret alien technology?

Plot
to be added

Cast

 * Kate Stewart - Jemma Redgrave
 * Osgood - Ingrid Oliver
 * Captain Josh Carter - James Joyce
 * Felicity Lyme - Alice Krige
 * Jay Roy - Asif Khan
 * Dr Kenton Eastwood - Tyrone Huggins
 * Sir Peter Latcham - Nigel Carrington
 * Radio Announcer/Quizmaster - Beth Chalmers

Continuity

 * Kate mentions her eldest. (HOMEVID: Downtime)
 * While showing a projection of her thoughts to Jay Roy, Osgood accidentally remembers seeing a police blue box and a man in a bow tie at the Tower of London. (TV: The Day of the Doctor) This places the events of this story after the human-Zygon peace treaty and means that Osgood in this story is one of the Osgood sisters, human and Zygon. (TV: The Zygon Invasion / The Zygon Inversion)
 * Osgood mentions the Vault. (AUDIO: Tales from the Vault)
 * Osgood's message tone is the Cloister Bell. (TV: Logopolis)