An imbecile, a Glitter Gun, and not the Seal of Rassilon
Having floated through time and space using the Time Lord Time Ring, The Doctor, Sarah Jane Smith and Harry Sullivan arrive back on Nerva, except they’re thousands of years too early and the TARDIS hasn’t caught up with them yet.
To top it off, the station’s full of dead people and rather than being used to house the frozen remains of humanity, Nerva’s 30-year mission is now to warn passing ships of a new addition to the bodies orbiting Jupiter, namely, the asteroid/planet/moon of Voga.
That’s not enough plot, though, surely! Voga’s also made of gold and inhabited by a race of dudes with white hair. And then there are the Cybermen, of course, and the traitor aboard the Nerva.
Now the Doc & Co have but four episodes to thwart the Cyber-plan to destroy the one thing we never knew was the only thing the Doc knew all along could destroy the Cybermen.
Also, check out Richard Tarrant’s article in the WBW blog: Tin Soldiers: Nostalgia and Revenge of the Cybermen