Interstitial (audio story)

 was the two-part story comprising part of the two hundred and fifty seventh release in Big Finish's monthly range. It was written by Carl Rowans and featured Peter Davison as the Fifth Doctor, Sarah Sutton as Nyssa, Janet Fielding as Tegan and George Watkins as Marc.

Publisher's summary
When the TARDIS is drawn off-course by temporal disruption, the Doctor and his companions discover a research facility conducting dangerous experiments. But how do you fight the future when time itself is being used as a weapon?

Part one
to be added

Part two
to be added

Cast
to be added
 * The Doctor - Peter Davison
 * Nyssa - Sarah Sutton
 * Tegan Jovanka - Janet Fielding
 * Marc - George Watkins

Continuity
to be added