Urgent Calls (audio story)

 was the part of the ninety-fourth monthly Doctor Who audio release produced by Big Finish Productions. It is the first single part story included with a three part story and the first solo Sixth Doctor story that was part of the monthly series since The Sirens of Time in 1999.

Publisher's summary
Urgent Calls (A One-Part Story)

Earth, 1974. An innocent phone call. Okay, it was a wrong number, but there can't be any harm in that. Can there?

Cast

 * The Doctor - Colin Baker
 * Lauren Hudson - Kate Brown
 * DJ - David Dobson
 * Connie Pickerill - Kerry Skinner

The Doctor

 * The Doctor does not believe in fate.
 * The Doctor quotes Thomas Jefferson when he says, "I'm a great believer in luck, and I find the harder I work the more I have of it."

Individuals

 * Lauren signs the Official Secrets Act.

Organisations

 * It is implied that the "army man" and doctor who visit Lauren in hospital are with UNIT. The Doctor asks Lauren if the latter was "tall with white hair and flamboyant clothes". However, this doctor was short, bald and wore ordinary clothes.

Technology

 * The virus, transmittable through telephone conversations, manifested as a six-inch long, metallic-looking worm or snake which wrapped itself around its host's spine.
 * It is implied that the virus was bio-engineered by the Viyrans.

Continuity

 * The Doctor tells Lauren that he has met Thomas Jefferson. (TV: The Lazarus Experiment)