The Sinestran Kill (audio story)

 was the first story in the eighth series of the Fourth Doctor Adventures, produced by Big Finish Productions.

Publisher's summary
When the Doctor decides to trace an anomalous energy signature on twentieth century Earth, he stumbles into an assassination attempt. Gangland thugs are trying to murder a seemingly innocent shopkeeper, and it’s only the intervention of the Doctor and Ann Kelso – a WPC who happens to be on the scene – that prevents a tragedy. But why do the gangsters want the shopkeeper dead? And what does this have to do with alien technology? The first stages of a grand conspiracy are about to be revealed. And finding the answers will take Ann Kelso on a journey like no other.

Part one
to be added

Part two
to be added

Cast

 * The Doctor - Tom Baker
 * Ann Kelso - Jane Slavin
 * Hugo Blake - Ewan Bailey
 * Jimmy Lynch - Nicholas Khan
 * Tony Reynolds - Leon Williams
 * DCI Scott Neilson - Frank Skinner
 * Kathy Blake - Glynis Barber

Continuity

 * The Doctor is again believed to be a Time Agent. (TV: The Talons of Weng-Chiang)
 * The Doctor is working on assembling K9 Mark II in his box, (TV: The Invasion of Time) and learns his brain is positioned "arrow A to the front." (TV: Destiny of the Daleks)
 * The cordolaine signal is associated with the Sontarans. (TV: The Sontaran Stratagem/The Poison Sky)