The Sontaran Project was the third story in the audio anthology, Encounters, produced by Big Finish Productions. It was written by Andrew Smith and featured Jemma Redgrave as Kate Stewart, Ingrid Oliver as Petronella Osgood and Ramon Tikaram as Vikram Shindi.
On a routine reconnaissance mission, Colonel Shindi finds more than he bargains for in the Forest of Ardennes. Back in England, an old colleague makes Osgood an offer she cannot refuse. The chance to take part in an exciting new scientific advance. Before long, UNIT is on collision course with a force of alien clones, and Kate must forge an unlikely alliance.
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- Kate Stewart - Jemma Redgrave
- Osgood - Ingrid Oliver
- Colonel Shindi - Ramon Tikaram
- Marshal Skar / Commander Merx / Sontaran Escapee - Dan Starkey
- Professor John Torrance - James Wilby
- Christine Colley - Beth Goddard
- Overseer - Matthew Cottle
- Aide / Soldier - Jot Davies
- Skar and Merx are of the Eighth Sontaran Battle Fleet.
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- Kate recalls the Sontarans' recent attempt to turn Earth into a Sontaran breeding planet through alteration of its atmosphere. (TV: The Sontaran Stratagem/The Poison Sky)
- The Auctioneers operate a black market dealing in alien material on Earth. (AUDIO: The Dalek Transaction)
- Malcolm has had all UNIT personnel immunized against the effects of known extraterrestrial pathogens and narcotics, like the Veralium truth serum. (TV: Planet of the Dead)