Return to Telos (audio story)

 was the eighth and final story in the fourth series of the Fourth Doctor Adventures, produced by Big Finish Productions. It was written by Nicholas Briggs and featured Tom Baker as the Fourth Doctor, Louise Jameson as Leela, John Leeson as K9 and Frazer Hines as Jamie McCrimmon.

Publisher's summary
The Doctor reveals to Leela that they're heading for the planet Telos. And K9 has new masters...

On Telos, in the past, the Second Doctor and Jamie are exploring the 'tomb of the Cybermen'.

Meanwhile, the Cyber-Controller and Cyber-Planner consolidate their plans. Spare parts from Krelos are being used to construct a mighty Cyber army. The Doctor must be captured.

Out of control, the TARDIS tumbles down a chasm and the Doctor and Leela find themselves caught up in full-scale planetary invasion.

Part one
As K9, controlled by an external force, drives the TARDIS away from Krelos, the Fourth Doctor informs Leela that he recognises their destination: Telos, the location of the last known Cyberman base, where a grand army lies dormant. He also guesses that what happened on Krelos has been the result of a Cyberman attack and infiltration, even if he can't explain how it happened.

Years in the past, the Second Doctor, Jamie McCrimmon and Peter Haydon are exploring the base with the archaeological expedition of Professor Parry.

Meanwhile, the Doctor realises they are travelling only in space, not in time; in fact, K9 is holding the TARDIS from entering the Vortex. The Doctor then throws himself at the console and pulls a lever, bringing the TARDIS inside the timestream continuum, and forcing K9 to set an emergency landing. As a result, the TARDIS crashes on Telos, but on a different point in time where the Cybermen intended - at the same time the Second Doctor is there with Jamie and Victoria Waterfield. K9 is also smashed to pieces by the violent impact: this allows the Doctor and Leela to dismantle him and find the Cybermat inside his brain that was controlling him. Seeing that the Cybermen were the first to interfere with their timeline has the Doctor changing his mind about going back in time, and to Krelos, to avoid the Cyberman invasion.

Back on Krelos, the Doctor and Leela reach Geralk and his associate, Relly, at the man's villa and accept their invitation to lunch. As Leela, Relly and the robot connected to Geralk's mind go into the kitchen to cook the fish it got earlier, the Doctor warns Geralk of the danger and then starts to scan the room of signs of Cybertechnology. As the robot in the kitchen puts the fish into a radar oven, this starts to malfunction: the contact with the robot has casually awakened the Cyberparasite stored inside it, and they quickly spread all around the town (which, being highly technological, is of course connected in his entirety), disrupting communication systems and alerting the Cyberfleet, whose arrival is almost immediate.

The Doctor wants to escape, but Leela opposes him, saying they have to save Krelos' people. The Doctor, persuaded, comes up with an idea, and tells Geralk to put on his robot control. As he does so, the Cybermen reach them, carrying a Cyber-conversion unit, and kill Relly; Geralk remains stuck in the machine, as the Doctor and Leela are surrounded by Cybermen.

Part two
The Doctor and Leela are saved by Geralk who, still in control of his robot, manages to snatch them and take them back to the TARDIS before being Cyber-converted in his turn. As a result, the robot stops working and begins to repeat words about the last thing he was doing when it met them: going fishing. As he watches it, the Doctor inadvertently touches the piece of tartan from Jamie's kilt he found in the TARDIS.

Then, he understands what happened. Years earlier, when he, Jamie and Victoria landed on Telos, Cyber-particles attached themselves to Jamie's clothes; when K9, tinkering with the ship, brought the control room back to an earlier configuration, those particles were activated and took control first of K9 and then of all the technology on Krelos, thus dooming the planet. Determined to prevent it from happening, the Doctor then decides to go back in time to Telos.

Cast

 * The Doctor - Tom Baker
 * Leela - Louise Jameson
 * K9 - John Leeson
 * Jamie / The Second Doctor - Frazer Hines
 * Geralk - Michael Cochrane
 * Peter Haydon - Bernard Holley
 * Relly - Veronica Roberts
 * The Cybermen - Nicholas Briggs

Continuity

 * The Doctor and Leela visit Telos at the time of his original visit with Jamie and Victoria Waterfield during his second incarnation in the 25th century. (TV: The Tomb of the Cybermen)
 * Jamie refers to his previous encounter with the Cybermen on the Moon in 2070. (TV: The Moonbase)
 * The Second Doctor refers to Eric Klieg while Peter Haydon refers to Professor Parry. (TV: The Tomb of the Cybermen)
 * Leela recalls the Doctor telling her that Jamie was a warrior. (AUDIO: The Fate of Krelos)
 * The Doctor and Leela return to Krelos. (AUDIO: The Fate of Krelos)
 * The Doctor refers to the TARDIS swimming pool. (TV: The Invasion of Time, Journey to the Centre of the TARDIS; AUDIO: White Ghosts)
 * The Doctor mentions the particulate vacuum cleaner. (AUDIO: The Fate of Krelos)
 * The Second Doctor says, "Oh, my giddy aunt!" (TV: The Krotons, The Three Doctors, The Two Doctors)
 * Cyber particles, called cyber-pollen, would later be used to convert dead bodies. (TV: Death in Heaven)