Scourge of the Cybermen (audio story)

 was the first release in The Audio Novels. It was written by Simon Guerrier. It featured the Third Doctor, Sarah Jane Smith and the Cybermen.

Summary
In the depths of the ocean on an alien world, there's a city run by scientists. The Doctor is only too eager to help them find new ways to counter pollution and produce entirely clean energy - research that he says will benefit the whole galaxy. But others have recognised the value of the sea base, and their interest is not so benign...

Left to her own devices, Sarah Jane Smith conducts her own investigation. The lights on the base keep flickering, which back home on Earth was the first sign that her bathroom was leaking. Out here in the depths of the alien sea, it's the first indication of a looming disaster.

Patiently, implacably, the Cybermen are determined to conquer the base and its resources. That includes all the men, women and children who live there.

As the Doctor once again battles his old enemies, Sarah rallies the trapped and terrified people. Then, to her horror, she realises that the Cybermen have used cold logic to predict exactly what the humans will do in order to survive...

Plot
to be added

Characters

 * Third Doctor
 * Sarah Jane Smith
 * Mercy Mercer

Continuity

 * The Doctor references the time when humanity cleaned up debris from Earth's orbit. (AUDIO: Scavenger)
 * The Doctor references time when he caught a Sontaran spy through humans empathetic reaction to yawning. (AUDIO: The Sontarans)
 * The Third Doctor previously encountered the Cybermen on Earth with Liz Shaw and UNIT (AUDIO: The Blue Tooth) and Burnt Salt with Jo Grant. (AUDIO: The Tyrants of Logic)
 * The Doctor makes a mental note to avoid further exposure to radiation. It was his exposure to the radiation of Metebelis III that ended up causing his next regeneration. (TV: Planet of the Spiders)
 * Later in her timeline, Sarah Jane Smith would encounter the Cybermen again on Nerva with the Fourth Doctor (TV: Revenge of the Cybermen, AUDIO: Return of the Cybermen) and in the Death Zone on Gallifrey with the Third Doctor. (TV: The Five Doctors)