Secrets of Telos (audio story)

 was the first story in the audio anthology Forty: Volume 1. It was written by Matt Fitton and featured Peter Davison as the Fifth Doctor, Sarah Sutton as Nyssa, Janet Fielding as Tegan Jovanka and introduced Christopher Timothy as Professor Parry and Ronan Summers as Captain Hopper.

Publisher's summary
Professor Parry’s expedition to the tombs of Telos was hardly an unmitigated success. The handful of survivors limp home in a spaceship…unaware that the deadly peril they faced from the Cybermen is not yet banished.

Into this situation stumble the Fifth Doctor and his friends Nyssa and Tegan - and they’re soon in a deadly fight for their lives.

Except things aren’t quite that simple - something odd is happening to the Doctor. He’s suddenly in a different part of his own timeline inhabiting his future self with no idea of why or how this has happened.

Who is bouncing him through time? And what could they possibly want?

Plot
to be added

Cast

 * The Doctor - Peter Davison
 * Nyssa - Sarah Sutton
 * Tegan Jovanka - Janet Fielding
 * Professor Parry - Christopher Timothy
 * Professor Vansom - Barbara Flynn
 * Morton - Tamzin Outhwaite
 * Captain Hopper - Ronan Summers
 * The Cybermen - Nicholas Briggs

Uncredited

 * Adric - Matthew Waterhouse

Medicine

 * Tegan is trained in first aid.

Time travel

 * The TARDIS has jumped back on her temporal vector to reach a stable time track, returning to Hopper and Parry's team on Telos mere hours after the Second Doctor departed.
 * The Doctor believes he jumped along his temporal vector, too, when he was pulled along his time stream, and that he may have "spread" this to the TARDIS in the first place.

Continuity

 * Captain Hopper and Professor Parry has just left Telos. (TV: The Tomb of the Cybermen)
 * The Doctor recalls that Parry works with the Brotherhood of Logicians, hired Captain Hopper, and lost several men on the planet below. (TV: The Tomb of the Cybermen)
 * Just before the Doctor switches into his personal future, Tegan reminds Adric about the Urbankans. (TV: Four to Doomsday)
 * Nyssa suspects that Tegan's sudden return and the trouble with Omega may have caused the Doctor to forget their recent adventures. (TV: Arc of Infinity)
 * When the Doctor arrives in his future, Tegan and Nyssa attempt to avoid telling him about Adric's death. (TV: Earthshock)