The TARDIS materialises in the snowy Himalayas, and the Doctor makes a return visit to the nearby Det-sen monastery, which he last visited three hundred years ago. He his astonished to find the monastery under attack, apparently from the Yeti which are said to roam the mountainside. Furthermore, the Doctor discovers that his friend the High Lama his still alive, his ancient body under the influence of an apparently unearthly force...
Meanwhile, explorer Edward Travers is determined to track down and capture one of the Yeti. When his colleague is murdered, he refuses to blame the creatures and instead accuses the Doctor. The time-travellers discover that the Yeti are all-too prominent in the area - in fact, they are out to kill anyone who threatens the plans of the disembodies Intelligence which they serve...
When the TARDIS materialises just outside a sleepy English village, it appears the Doctor and Sarah Jane are nearly "home" at last. But all is not as it seems in rural paradise. White-suited, gun-wielding guards stalk the countryside, while the village itself is eerily deserted. As the Doctor and Sarah look on, a UNIT member leaps over a cliff to his death and, as the clock strikes twelve, the local pub is suddenly filled with strange robotic villagers. The UNIT member is amongst them, very much alive. What exactly is happening here?
The Doctor is mystified, setting off for UNIT HQ in search of answers. There, with the Brigadier away, Senior Defence Astronaut Guy Crayford holds court. But just who is his shadowy master, the Thraal, Styggron? Indeed, who are the Thraals and what have they got in store for the Earth? Why has the TARDIS dematerialised seemingly of its own accord?
The Doctor must move quickly to find the truth, for the very future of mankind hangs in the balance..
The Doctor, Romana and K-9 continue their search for the six disguised segments that make up the powerful Key to Time.
When the TARDIS lands on the seemingly peaceful planet of Tara, the Doctor claims he is owed a holiday. While he takes time off to go fishing, Romana quickly locates the Fourth Segment. All is going well until the time-travellers are drawn into the complex political intrigues of Tara.
The benevolent Prince Reynart is soon to be crowned king, but the wicked Count Grendel wants both the throne, and Reynart's bride-to-be, the Princess Strella, for himself. Grendel plots with the android builder Madame Lamia, and soon both Reynart and Strella are replaced by robotic duplicates. Unfortunately for Romana, she also bears a startling resemblance to the princess - which makes her enormously valuable to the Count.
With time running out, the Doctor is unwillingly thrust into the roles of android repair-man, king-maker and, ultimately, swash-buckling hero, when he finds himself duelling with Grendel, famous for being the finest swordsman on Tara...
The Doctor, Harry and Sarah accidentally arrive on an artificial satellite where the survivors of Earth lie in cryogenic suspension waiting to begin a new life. But the Doctor soon discovers that there has been a sinister intrusion...
A gigantic insect has infiltrated the human ark. It is dead, but it was Queen of the Wirrn, sworn enemies of the Earth — and her egg sac was full. Something is terribly wrong and when the crew begin to awaken it soon becomes clear that some of them are not entirely what they seem...
The Doctor must find out how to destroy the Wirrn larvae before they absorb the last of the human race and become an invincible swarm. But this involves a desperate gamble with his own life — a gamble he must take if he is to save mankind.
The Doctor, Romana and K-9 conclude their search for the segments that make up the powerful Key to Time.
Arriving on the planet Atrios, the Doctor and his companions become embroiled in the Atrians' seemingly endless war with their neighbouring planet of Zeos. Their ruler, the Princess Astra, has been kidnapped, leaving the deranged Marshal in sole charge of the war effort. However, the Marshal is being controlled, receiving orders from behind a strange black mirror in the command centre.
The Doctor learns that no-one on Atrios has ever seen a Zeon, and travels to Zeos in an attempt to bring the war to an end, and hopefully find the Princess Astra - who seems to be linked in some way to the Sixth Segment. He finds the planet deserted, run entirely by a huge computer, Mentalis. When the Marshal launches an all-out final attack on Zeos, Mentalis responds by activating its Armageddon Program - rather than lose the war, the computer will destroy everything.
However, a third planet hangs in space between Atrios and Zeos, shielded from their sensors. This is the lair of the Shadow. He has been waiting for the Doctor to arrive, manipulating the war to his advantage. He is willing to use the Doctor's own friends against him and he wants the Key to Time.
Although the Doctor's quest is nearly over, he begins to realise that he may lose everything. For the Shadow is a servant of the Black Guardian.
Exiled to Earth in the late 20th Century by his own people — the Time Lords — the newly regenerated Doctor arrives in Oxley Woods alongside a shower of mysterious meteorites. Investigating these unusual occurrences is the newly-formed United Nations Intelligence Taskforce — UNIT for short. Led by Brigadier Alistair Gordon Lethbridge-Stewart, UNIT are soon called into action when people and meteorites start going missing. Most puzzling of all is the attempted kidnapping of a strange hospital patient — a man with two hearts, who insists that he knows the Brigadier...
The new Doctor soon joins forces with his old friend, UNIT and the recently recruited Dr Liz Shaw, but time is running out...
Irregular things are happening at a nearby plastics factory, while faceless creatures lurk in the woods. The Nestenes have arrived, and want to conquer the Earth...
The Doctor and Sarah arrive on the desolate planet of Karn amid a graveyard of crashed space-ships. As they explore they come to a ruin and are welcomed by Professor Solon and his strange servant Condo. Solon is seemingly the perfect host but his underground laboratory holds a hideous secret... Morbius, exiled Time Lord, greatest criminal mind in the galaxy and long presumed dead, is not entirely dead, and Solon is in the process of bringing him back to life.
The only other inhabitants are the ancient sect of the Sisterhood of Karn who are out to avenge themselves against the Time Lords. Can the Doctor prevent the evil Morbius from regaining absolute power or will he be sacrificed by the Sisterhood?
The Doctor and Jo take the TARDIS on a test flight. They arrive on a cargo ship, the SS Bernice, that appears to be crossing the Indian Ocean in 1926 but is in fact trapped inside a miniscope — a banned peepshow of miniaturised life-forms — on the planet Inter Minor.
They enter another section of the scope but find themselves confronted by ferocious Drashigs. The Doctor eventually breaks out of the scope and returns to full size. The device is owned by a pair of Lurman entertainers, Vorg and Shirna, who hope to make a quick profit from Inter Minor's hitherto reclusive natives.
While caving in Derbyshire, two pot-holers are attacked by a huge creature and one is killed. At the nearby Wenley Moor nuclear research centre, which is built into the same caves, there are strange power losses threatening the reactor. Not only is everyone is at a loss to explain these incidents but there is also a high number of breakdowns involving staff members.
Now exiled to Earth and working for UNIT, the Doctor and his assistant Liz are sent for. As the surviving pot-holer begins to make cave-paintings in his ward the Doctor discovers not only a Tyrannosaurus Rex but a colony of Silurians - intelligent, walking lizards who have been dormant for millions of years. Now they have awoken to find that mankind has replaced them as the rulers of Earth - and they want it back.
Can the Doctor find a way of thwarting their plans or will humanity be wiped out to usher in a new Age of the Lizards?
A mysterious UFO lands on Earth. The Axons have arrived, desperate for help and eager to offer in return an exciting gift - axonite, potentially the most powerful substance man has ever seen. With its powers of duplication, the possibilities for mankind are endless. The Ministry of Defence is delighted but the Doctor has his suspicions. Are the Axons as genuine as they seem? Just what is the Doctor's arch enemy, the Master, doing aboard this ship?
On the planet Chloris, metal is scarce. Without metal to make the tools needed to keep the jungle under control, lush plant life dominates. The Lady Adrasta controls the planet's very last metal mine, holding on to power through the Huntsmen and the Wolfweeds.
Making a forced landing on Chloris, the Doctor, Romana and K9 soon find themselves caught up in dangerous events...
The Doctor is captured by the power-hungry Lady Adrasta, who needs his scientific skills. Romana is taken prisoner by rebel bandits, looking for ways of getting their hands on Adrasta's wealth. K9 is made of metal — a valuable commodity indeed...
It's 12th Century Palestine and King Richard the Lionheart is embroiled in a Holy War against the Saracen ruler, Saladin.
After Barbara is abducted in a Saracen ambush, the Doctor, Ian and Vicki make their way to the King's palace. At first, the King will not help with her rescue, but he relents and lets Ian attempt it, equipping him for the task with a knighthood.
Meanwhile, the King's secret plans to make peace with Saladin are discovered and all hell breaks loose. The Earl of Leicester suspects the Doctor's influence in the King's new-found desire for peace. It is time the Doctor left...
On its way back to Earth, the TARDIS crashlands on Peladon where strange and violent incidents are threatening to disrupt a conference between visiting delegates from the Galactic Federation and Peladon's King. Is this the feared curse of Peladon and will it force a Galactic war?
Having assumed the guise of Earth delegates, the Doctor and his assistant Jo attempt to diffuse the political timebomb and to uncover the true identity of the beast of Peladon - which they suspect is something far more sinister than a mere paranormal apparition.
The Doctor is amazed, however, to find among the delegates his old adversaries the Ice Warriors - war-like reptiles from the planet Mars. Could they be behind the goings-on and what they stand to profit from a conflict? The Doctor must use all of his wits to ensure that the warnings of Peladon's High Priest do not come true.
A mysterious virus is wrecking havoc among the crew of the Earth's weather control station on the moon. While investigations into the strange disease are in progress, International Space Headquarters Earth puts the entire Moonbase into strict quarantine - the Doctor, Ben, Polly and Jamie included!
To take matters worse, the personnel of the Moonbase inexplicably vanish, and vital weather control equipment is sabotaged. Who is responsible? The Director of the base suspects the time-travellers. But the Doctor fears a ruthless enemy from his own past responsible... that the evil Cybermen have returned...
For 200 years the secret of Devil's End village has lain dormant, as the burial mound, the so-called Devil's Hump, has remained sealed. Until now, at midnight on April 30th on the greatest occult festival of the year, as Professor Horner prepares to break it open. But just what evil treasures lie buried there? Will the local white witch's warnings of doom and destruction be fulfilled? Who or what is the mighty Azal? But even more disturbing for the Doctor and Jo, just how is the Reverend Magister, alias the infamous Master, involved in the mystery?
The TARDIS lands on Skaro, a seemingly dead world with high levels of radiation. Seeing a deserted city, the Doctor deliberately sabotages his TARDIS in order to force Ian, Barbara and Susan to explore further. But the city is not as dead as it first appears. The TARDIS crew are captured by sinister metal creatures that silently glide through the corridors and walkways - Daleks!
Survivors of a deadly nuclear war with their enemies the Thals, the Daleks have mutated into creatures dependent on their travel machines to keep them alive. One by one, the time-traveller captives succumb to the effects of Skaro's radiation, leaving Susan their only hope in retrieving life-saving drugs from the TARDIS.
Outside the city, the peaceful Thal survivors are running out of food and supplies - but can they trust the Daleks to aid them? With the TARDIS stranded, the Doctor and his companions are caught up in a battle for survival between the two species.
And time is running out - the radiation-dependent Daleks plan to explode another neutron bomb, killing all life on Skaro...
Radiation nil, oxygen normal, pressure normal…an earth reading! The TARDIS has landed in London. A menacing deserted London, with no sign of life and no sense of normality, but the decaying city is not as empty as it seems.
The year is 2164 and the travellers soon find themselves facing antagonists whom they thought they had destroyed…the Daleks. They have conquered the earth. Ten years after a cosmic storm, continents of people were wiped out by a plague. Then the Daleks came in saucers, shipping humans to vast mining areas, turning them into Robomen and against their fellow humans.
Earth contains something no other planet contains-a magnetic core-but why are the Daleks digging for it and how can the Doctor prevent them from tampering with the forces of creation?
World peace hangs in the balance. Sir Reginald Styles, a high-ranking diplomat is the only person that stands between mankind and a third and final World War. But a mysterious and savage guerrilla force from the 22nd Century believe Styles is the agent that shaped their terrifying future and therefore must die...
The Doctor and Jo find themselves flung into the guerrillas' world; a brutal dictatorship policed by the merciless and ape-like Ogrons. The Daleks have invaded Earth, enslaved the population and face certain triumph unless the Doctor betrays all he believes in and condones the cold-blooded murder of Styles in an attempt to change the course of history... irrevocably.
A mysterious evil is at work on Gallifrey. The President of the Time Lords has been assassinated and the Doctor caught red-handed. An inexorable master plan has been set in motion. There can be no escape.
In order to prove his innocence the Doctor must pursue his enemy into the Matrix, a dream-like repository of knowledge formed from the minds of dead Time Lords. However, he quickly discovers that in the Matrix the real assassin rules and behind this enemy lurks the even more deadlier menace of his old adversary - the Master.
An inexplicable power-loss strands the TARDIS on the sinister planet Exxilon where the Doctor meets an expedition from Earth seeking a rare material that can cure the virulent space plague that threatens all human life throughout the galaxy. Nearby, Sarah discovers a mysterious, living Citadel but is captured by the savage Exxilons who prepare her for sacrifice...
The Doctor must uncover the secrets of the ancient Exxilon City, locate the source of the power-drain, save Sarah and help the Earth expedition. But his plans are threatened by new arrivals on the planet - the Doctor's oldest and deadliest enemies - The Daleks!
Accompanied by the newly regenerated Romana, the Doctor lands on a mystery planet intrigued by the evidence of drilling taking place there, deep underground.
The discoveries he makes are chilling. For the planet is Skaro and the Daleks are in charge of the operation. But just what are his old enemies searching for? And why?
Perhaps the answers lie with the Movellans, a beautiful humanoid race led by Commander Sharrel. They are waging a war of their own with the Daleks and the situation is now stalemate. Should the Doctor tip the balance of power to aid the Daleks' ultimate destruction? Or are their intentions no less sinister than the Daleks' themselves?
Suddenly the Doctor finds himself enmeshed in a deadly battle which could result in the destruction of the universe itself as, once more, he summons the strength to face an all too familiar, timelessly evil adversary.
The Doctor and Sarah arrive back in the TARDIS to find London completely deserted - except for the dinosaurs. Has the return of these prehistoric creatures been deliberately planned and, if so, who can behind it all?
The Time Lords discover that the Master has stolen secret files revealing the location of the dreaded Doomsday Weapon. They summon the Doctor out of his exile on Earth and send him five centuries into the future to the planet Uxarieus to retrieve and safeguard this vital information.
Arriving on Uxarieus, the Doctor and Jo encounter a group of Earth colonists whose very existence is under threat due to failing crops and low morale. Representatives of the ruthless Interplanetary Mining Corporation are disputing the colonists’ claim to the planet.
Their only hope is placed on the imminent arrival of an Adjudicator from Earth to resolve the dispute. Meanwhile, the Doctor pursues his mission, but first he must deal with giant lizards, killer robots, and deadly primitive tribesmen – knowing all the while that the Master cannot be far away.
No sooner have the Doctor, Jamie and Victoria landed on a sun-kissed Australian beach than they are being shot at by murderous fanatics! A dramatic helicopter rescue places them in the hands of Astrid Ferrier and Giles Kent, two people intent on bringing about the downfall of the world's most dangerous man - who happens to look exactly like the Doctor.
This is Earth in the near future, and Salamander's Sun-Catcher technology has been hailed as the answer to all the world's food problems. Yet is there more to his prediction of natural disasters than meets the eye? Could it be that the death and destruction which he appears to foretell is in fact of his own creation? Jamie and Victoria infiltrate Salamander's Hungarian palace to gain proof of his misdeeds, whilst the Doctor must impersonate the dictator in order to stay alive. In doing so he witnesses the might of his brutish regime, and discovers the terrible secret which lurks beneath the Kanowa research centre.
One of the time travellers' most dangerous adventures ever takes place against a backdrop of volcanos and earthquakes, deadly high-speed chases, assassination attempts and spectacular explosions. Ultimately it will lead them to a climactic confrontation between the Doctor and his murderous double...
The TARDIS lands on a planet the Doctor doesn't recognise - but its inhabitants seem to know him. They think he's the Evil One and aren't pleased to see him.
Two warring tribes occupy the planet: the savage Sevateem and the reclusive Tesh, separated from each other by a deadly energy field. When the Sevateem believe their God, Xoanon, to be a captive of the Tesh, they decide to break through the barrier and rescue him. The Tesh, however, have other ideas.
Befriended by Leela, a Sevateem girl who dares to question the mighty Xoanon, the Doctor sets out to discover exactly what's happening on this planet. Has he been here before? Is he responsible for the tribal wars? And can it possibly be that Xoanon, the mad God, is really the Doctor?
The Doctor discovers the TARDIS has fallen into E-Space, an alternate universe, and landed on the planet Alzarius. The Doctor and Romana find its only inhabitants are living on a vast, crashed spaceship they have been repairing for generations to return to their home planet, Terradon. But Mistfall, a mythical time of terror, is coming again to Alzarius, and an eerie menace is rising out of the misty marshes.
But why have huge poisonous spiders begun to appear in the Alzarian food supply? And what is the secret of the strange marshmen? The Doctor and Romana must solves these riddles and more if they are to have any chance of returning to their own universe.
Back on the dreaded Skaro again, a world torn apart by a thousand-year-long war, the Doctor's on a mission from the Time Lords themselves... simple enough. All he has to do is destroy the Daleks before they evolve and face their evil creator, Davros.
With the Doctor behaving rather oddly after his regeneration, the Brigadier finds a scientific research station under attack after a robot steals the plans for a new disintegrator gun.
Could the members of the mysterious Think Tank be responsible for the giant invader? How sinister are the intentions of the shadowy Scientific Reform Society? More importantly, can the Doctor recover in time to save the Earth from Atomic War?
Earth, South Wales. The suspicious death of a miner at the inactive local pit owned by the mysterious Global Chemicals brings UNIT to sleepy Llanfairfach. There, a local green group - the Wholeweal Community under the leadership of the brilliant Professor Jones - are not convinced of Global's innocence in the affair. Could the waste products from their revolutionary new oil refining process be at fault? Jones is convinced but the Doctor is not so sure and a dangerous expedition down the mine confirms his fears. For there, thousands of giant maggots lie gestating - a dangerously unknown terror waiting to be unleashed upon the world. But by whom? Just who is the power behind Global Chemicals? Who or what is the Boss? And what are his/its plans for the Earth?
The Doctor, Jo and the Brigadier must move quickly to find the answers, for the death toll is already rising and the gestation period of the maggots down the mine is coming to an end...
Eldrad was once hailed as the saviour of the world of Kastria. He erected force-barriers around the planet, preventing its imminent destruction. However, when the Kastrians refused to submit to his dictatorship, he removed his force-fields, condemning an entire civilisation to a slow and agonising death. For this, the mightiest of crimes, the people of Kastria sentenced Eldrad to obliteration.
Millions of years later, the Doctor's TARDIS materialises in an English quarry. A freak accident traps the Doctor's young friend, Sarah Jane Smith, under tons of rock. When she is rescued, she is frantically clinging to a large stone hand. Taken to a local hospital, it soon becomes clear that Sarah has been possessed.
After she goes missing - still clutching the hand - the Doctor follows the trail of death and destruction to a nearby atomic power station.
What strange power does the hand have over Sarah? Why has she fought her way to the very core of the nuclear reactor? How can she possibly survive the normally lethal radiation? To answer these questions, the Doctor must travel across the galaxy to a long-dead world - after which, life will never be quite the same again...
It is the turn of the century, and the TARDIS materialises by the lighthouse on the desolate isle of Fang Rock. When the engineer dies in mysterious circumstances, the remaining crew blame the mythical Beast of Fang Rock - until the Doctor and Leela turn up...
When a small clipper runs aground on the crags of Fang Rock, the lighthouse offers shelter to its desperate passengers. But the Doctor soon discovers clues that suggest that no one is safe on the tiny island.
Whilst a private drama unfolds between the survivors of the wrecked clipper, another death occurs. The Doctor suspects a ruthless alien lurks in the thick unnatural fog around the island, and secures the lighthouse. But has he really locked the horror out, or is it somewhere inside with them...?
The Doctor, Jamie and Victoria arrive on Earth in the far future to find that the planet is in the grip of a second ice age. Scientific outposts are scattered across the globe, fighting desperately against advancing glaciers that threaten to send the world back into prehistory.
When a huge armoured figure is discovered buried in the ice, a force more deadly than the ice floes is unleashed - Varga, a Martian Warrior, whose craft crash-landed centuries ago. Reviving his crew, he aims to conquer Earth in the name of Mars.
With power at the outpost sinking to dangerously low levels, it falls to the Doctor to try to save humanity - not only from the warmongering Ice Warriors, but from the barely checked powers of the relentless glaciers.
When a tussle with a sonic time scan leads the TARDIS back to Earth, the Doctor and Leela discover strange happenings in a nearby lab run by the secretive Dr Fendelman. By night an eight million year old skull glos with a devastating power, leaving destruction in its wake. Already two people lie dead in mysterious circumstances. The Doctor is appalled. Can the Fendahl, the creature from his childhood fairytales, really be emerging from its twelve million year hibernation? And if so, can he stop its energy-draining progress through the Earth's population? The very safety of the planet depends upon it...
The Doctor is behaving oddly, having clandestine meetings with a race known as the Vardans who can travel via the power of thought. Leela is concerned - and she worries further when she learns that K9 has been instructed to shoot her if she attempts to interfere.
Returning home to Gallifrey, the Doctor demands to take over as Lord President of the High Council of Time Lords. With no-one able to dispute his claim, he is inducted and begins a systematic purge of Time Lord society, expelling many high ranking officials - and Leela - to the wastes of Outer Gallifrey.
It seems that the Doctor has joined forces with the Vardans, and is helping in their attempted conquest of Gallifrey out of revenge for his treatment at the hands of previous High Councils. The Vardans want the secrets of time travel and with only his old teacher, Cardinal Borusa, at his side, the Doctor appears to be granting them their wish. But not everything is exactly what it seems. The Doctor has an agenda hidden from the Vardans - and they in turn have a far darker one hidden from him.
A three-man shuttle crew are completing the final stages of their journey to Titan base, when a course deviation puts the shuttle in the path of a mysterious cloud in space. The crew members arrive on Titan, but they have been somehow changed, infected by an intelligent virus that threatens everyone in the galaxy. The TARDIS picks up a Mayday message from Titan base, but before the Doctor and Leela can fully respond, the police box also passes through the mysterious cloud. With the infection spreading from person to person, the Doctor and Leela seek assistance on a medical station in the asteroid belt. As the situation worsens, their only hope lies in the unlikely combination of the eccentric scientist Professor Marius, and his dog-shaped computer K9...
The empire of Traken has lived in total harmony for over a thousand years, governed by the sacred Keeper and his loyal consuls. Until now. Fading fast, the Keeper calls the Doctor and Adric to Traken, fearing the impending disintegration of his world and the onset of a terrible evil. For the malignant presence of the Melkur lurks close by, growing stronger, plotting to replace the Keeper upon his death.
The Doctor must stop it before it gains control of the Source - the energy that sustains the very life of the planet. But just who is controlling the Melkur? The Doctor smells a rat of the very oldest kind...
Materialising on an island of glass in a sea of acid, the Doctor, Susan, Ian and Barbara find themselves chosen to embark on a perilous quest set by Arbitan, Keeper of the Conscience of the planet Marinus.
The Conscience machine has the power to control the minds of everyone on Marinus, and it is in danger of falling into the hands of the sinister Yartek, leader of the alien Voord. To prevent disaster, the TARDIS crew must recover the machine's operating keys, hidden in various locations around the planet. Others have attempted this task before - but none have ever returned.
From Morphoton to Millenius, battling ice soldiers and deadly plants, overcoming hypnotic conditioning and hostile witnesses, this trek across Marinus promises to be the four travellers' most challenging adventure yet.
The Argolin-Foamasi War lasted for just 20 minutes, during which time the planet of Argolis was turned into a blasted cinder - a radioactive wasteland deadly to almost all.
The few surviving members of the now ageing and sterile Argolin race made a remarkable decision: the story of their people and the husk of their world would stand as a lesson to the galaxy about the horrors of war. The planet would become the most unlikely of holiday resorts...
To the Doctor and Romana, Argolis seems like a restful and fascinating place to relax after their recent adventures. They can take in the beauty of the multi-coloured shifting sands from the safety of the towering Leisure Hive, and catch up with Argolin advances in the obscure science of tachyonics.
Typically enough, however, murder and intrigue follow the time travellers wherever they go; and a lunatic's plan to restore Argolis' proud warrior past could, quite literally, tear the Doctor and his friend apart...
When the Doctor, Sarah and Harry arrive in Scotland, having received an urgent request for assistance from the Brigadier, they discover that the mysterious force which has destroyed three oil rigs has left giant teeth marks on the wreckage.
The mystery deepens leading them to the shores of Loch Ness where they find that the legendary monster really does exist - and it's the murderous tool of the Zygons, aliens intent on overpowering the planet. The Doctor and his companions must find a way to defeat the deadly Loch Ness Monster and its controllers, but the Zygons have the terrifying power to change shape and the Doctor is in grave danger when he finds that his friends and allies are not always what they seem...
Haunted by a shadowy watcher, the Doctor's bound for Logopolis in search of a new chameleon circuit for the TARDIS, with a dangerous stowaway on board.
Now in a new body, and bent on Universe domination, his arch enemy the Master is back with a vengeance. His plan could rock Logopolis, the keystone of all life. Could this mean the unravelling of the causal nexus and the end of the universe itself?
The Doctor must pit his wits against the Master in a desperate battle to thwart his plans aware that this might be a fight which could easily spell the end of his life.
Forced off course by the Mandragora Helix, the Tardis lands in the province of San Martino in fifteenth-century Italy. Here, the court astrologer, Hieronymous, has been taken over by the Mandragora energy-form — Hieronymous and the other members of his star-worshipping black magic cult will be used as a bridgehead, enabling the Mandragora Helix to conquer the Earth and rule it through their chosen servants.
The Doctor has to defeat not only the Mandragora energy, but the evil schemes of the murderous Count Frederico who plans to usurp the place of his nephew, the rightful ruler of the province.
The TARDIS brings the Doctor and Sarah to the medieval planet Peladon, some half a century after the Time Lord's first visit. Now under the benign influence of the Galactic Federation, the Pel nobles enjoy new riches and new technology.
But the Federation is at war with Galaxy Five, and Peladon has taken on a new tactical importance; it is rich in the rare mineral trisilicate, which is vital to the war effort. The Pel miners, however, are in revolt. For too long they have been overworked and taken for granted by the Federation and the Pel royalty. They believe that Federation machinery has awoken the spirit of the legendary Aggedor, who is now slaughtering aliens and unbelievers. As open rebellion erupts, the Federation sends in a hard-line military taskforce - Commander Azaxyr and his Ice Warriors.
The Doctor and Sarah must not only act as peace-keepers between the warring factions but also discover the truth behind the 'spirit'. They soon learn that the Galactic Federation has been infiltrated by traitors and spies, determined to destroy the alliance from within...
What was happening to the people of Solos? Why are they gradually turning into Monsters? Hands that become claws, flesh that turns scale-like...
When the Doctor meets the Marshal and Jaeger, he realizes that all is not as it appears to be. The Marshal has a sinister plan to gain control of this planet, and it's up to the Doctor to save Solos from this mad earthman, as well as save the Solonians themselves.
The TARDIS lands at the site of a hyperspatial collision between two spacecraft, the Empress and the Hecate. As a result, neither ship is dimensionally stable, risking the lives of all those aboard. The Doctor, K9 and Romana offer to help out.
When a crewmember is found dead, his face lacerated by huge claws, it seems something deadly has been released by the accident. But how is the death linked to the discovery that the killer drug Vraxoin has been smuggled aboard - and where has the supply come from?
The Doctor soon realises that the aliens stored in a projection machine may hold the answers - and that the cages holding these specimens are anything but secure as the savage Mandrels, hideous swamp-creatures from the planet Eden, tear through the corridors of the helpless spaceships...
Injured after a shoot-out between his old nemesis the Master and the Ogrons, slaves to the evil Daleks, the Doctor sends a message to the Time Lords, asking them to pilot his TARDIS and follow the Daleks to their new base. After he slips into a coma, it falls to his assistant Jo Grant to explore the planet where the TARDIS finally materialises.
Not only must the Doctor contend with the Daleks' new stratagem, but he must try to stop them unleashing a plague that will exterminate all organic life. When a rescue ship of Thals arrive, they bring with them darker news still - somewhere on Spiridon 12,000 Daleks are waiting to emerge and take what they believe is their rightful place as the Universe's supreme beings!
A distress call from the last planet in the known universe forces the TARDIS to commence emergency materialisation on Zeta Minor. Simultaneous with the Doctor's arrival, is the landing of a spacecraft from the planet Morestra on a rescue mission to recover a missing group of scientists. An expeditionary force from the spacecraft soon uncovers their sinister remains, but who or what has caused their gruesome deaths?
Only one scientist, Professor Sorenson, has survived and he is hell-bent on tapping the powerful resources within Zeta Minor to save his own planet which is slowly dying. But he and his compatriots cannot possibly realise the full extent of the dark forces at work. And so it is left to the Doctor to convince them that Zeta Minor is indeed, the Planet of Evil...
In the last and most dangerous adventure of the Pertwee years, what begins as innocuous research into ESP turns into a deadly mind battle, with the terrifying spiders from the planet Metebelis Three pitted against The Doctor, his friends and Time Lord K'anpo.
At a Tibetan-style spiritual retreat deep in rural England, a clandestine circle of chanting brethren unknowingly call upon the evil powers of the Metebelis Spiders, whose quest for the perfect blue crystal leads them straight to the Doctor. He must travel to the alien planet to meet the Great One, merciless ruler of her spiders and human slaves, who plans to take over Earth.
The future of the entire universe is in the Doctor's hands, but if he is to face the fear the Great One sees in his mind, then he must face the certainty of total destruction. Could this be the Time Lord's final death?
The Doctor, Romana and K-9 continue their search for the six disguised segments that make up the powerful Key to Time.
The TARDIS brings the Doctor and Romana to Delta 3, the third moon of the planet Delta Magna. Romana is captured by the Swampies, the original inhabitants of Delta Magna, displaced from their home world by human colonists. They intend to sacrifice Romana to their god, the mighty Kroll.
The Doctor's search for his companion brings him to a massive refinery in the middle of the swamp, which is extracting protein from under the water to feed the people of Delta Magna. The Doctor is mistaken for Rohm-Dutt, an amoral gun-runner who is supplying the Swampies with weapons to aid them in their plan to attack the refinery and force the workers to leave Delta 3.
The Doctor escapes the refinery in time to rescue Romana from the sacrificial altar, discovering in the process that Kroll is just a myth, a story to frighten children. They resolve to find the Fifth Segment and leave the moon, avoiding the intrigues of the refinery workers and the attentions of the fanatical Swampies.
However, all is not as it initially seems. What is stirring on the floor of the swamp and can the instruments on the refinery really be correct in saying that it is five miles across? The Doctor realises that Kroll is more than a mere legend and its centuries-long slumber has been disturbed by the refinery. Now it is awake, the time-travellers find that it is very large, and very hungry...
Returning to UNIT HQ on Earth, the TARDIS is thrown violently about by a mysterious force and Sarah and the Doctor arrive instead at an old priory in the year 1911. The owner, Marcus Scarman, has been excavating ancient tombs and is possessed by the spirit of Sutekh, bringer of 'the gift of death to all mankind'.
Sutekh has lain for thousands of years in his pyramid prison and Scarman and his robot mummies plan to release this ancient and evil power. Will Sutekh the all-powerful be freed from his bonds and destroy the world, or will the Doctor manage to bring about his destruction?