'I'm being stalked. I'm sure of it now. I'm frightened, and I need a friend.'

Lizbeth Fugard is an archaeologist working on a backwater rock of a world. She's bankrolled by a government she despises, and has recently split up with her partner. And, just when she thinks life can't get any worse, someone starts following her - keeping to the shadows, but always there. Watching. Waiting. Eyes boring into her soul. The most beguiling eyes she has ever seen - and the most terrifying.

All she can think of is to call on the help of her old friend Professor Bernice Summerfield, and Bernice is only too happy to get away from her own work and see a bit more of the galaxy.

But on arrival she is soon immersed in sabotage, political secrets, gun-running, and an age-old love affair that ended indisaster and disgrace. To end a cycle of violence and hate, Bernice and Lizbeth must discover the truth - but doing so could have implications far beyond this obscure world.

There are many beasts and monsters in the universe, it is true.  But the worst of them in Man.

A terrifying alien army is sweeping across the landscape, decimating towns and subjugating everyone and everything in its path.  With their astute military tactics and advanced weaponry, the invaders seem unstoppable.

But this is no distant star, no alternate timeline.  Trapped in a frightened city, the Doctor and his companions discover that this is Earth history, and they are powerless to intervene.  The impending slaughter of thousands is a matter of grim historical fact.

Not everyone within the city is prepared to accept their fate.  Desperate people embark upon desperate courses of action.  They may even succeed.

For, deep beneath the city, something truly alien is stirring…

From the outer reaches of the Solar System, alien eyes are surveying the Earth. Eyes as cold and cruel as the methane ice that shrouds their distant world…

The Doctor is perturbed when a spate of deaths follow the break-up of an alien mass in the atmosphere. But this is merely the latest incident in a sinister conspiracy that threatens the entire planet, and the Doctor himself is embroiled in the plans of all the players.

The Brigadier's concern is heightened by the possibility of traitors at the very heart of UNIT. Leaving for Geneva to discover the truth, he little realises the deadly motives of an enemy agent on his own doorstep. The Doctor and Liz, meanwhile, discover that London doesn't have a monopoly on alien invasions.

What are the gargoyle-like creatures that kill without mercy? What do they want from our planet - and how do they figure in top-secret governmental plans?

As the lines between allies and enemies begin to blur, the Doctor finds himself fighting to save the Earth once again. But who will he be saving it for?

Featuring the third Doctor, Liz Shaw and UNIT, this adventure takes place between the TV stories INFERNO and TERROR OF THE AUTONS.

'It is said that this city rests over the great menagerie. Men who felt tempted to meddle in science were cursed and turned into beasts.'

A nameless city on a primitive, rain-sodden planet. The ruling Knights of Kuabris strive to keep order as hideous creatures emerge from the sewers to attack the populace. It seems that there might be some truth in the prophecies after all.

While Jamie languishes in the castle dungeons, the Doctor is forced to lead an expedition beneath the city to search for the fabled Menagerie of Ukkazaal. Meanwhile Zoe has been sold as a slave to a travelling freak show - and one of the exhibits in coming to life.

The near future: a man in a psychiatric hospital claims to be an alien time traveller called 'the Doctor'.  He once adventured across countless galaxies, fighting evil.

The past: an asylum struggles to change Victorian attitudes to the mentally ill.  It catches fire in mysterious circumstances.

Now: a young woman takes an overdose and slips into a coma.  She dreams of death falling like a shroud over a benighted gothic building.

Caroline 'Laska' Darnell is admitted to the Retreat after her latest suicide attempt.  To her horror, she recognises the medical centre from the recent nightmares of an old building haunted by a ghostly dog with glowing eyes.  She knows that something is very wrong with the institute.  The mysterious Dr Smith is fascinated by Laska's waking dreams and prophetic nightmares.  But if Laska is unable to trust her own perceptions, can she trust Dr Smith?

And, all the while, the long-dead hound draws near...

This is another in the series of adventures for the Eighth Doctor.