Robot by Terrance Dicks, directed by Christopher Barry
When the secret plans to a disintegrator gun are stolen by what appears to have been some kind of giant robot, the newly-regenerated Doctor is quickly called in to investigate. The trail leads to a group of right-wing scientists called Think Tank, who are seeking to use the robot and disintegrator gun to impose their edicts on humanity. At the story's conclusion, Harry Sullivan leaves in the TARDIS with the Doctor and Sarah.

The Ark In Space by Robert Holmes, directed by Rodney Bennett
The TARDIS brings the Doctor, Sarah and Harry to the Nerva Beacon in the far future, where the remnants of humanity have been placed in suspended animation due to the risk of solar flares on Earth. The humans have overslept by millennia, however, due to the incursion of the insect-like Wirrn. More Wirrn are gestating within Noah, the Beacon's leader, and as Noah starts to succumb to the alien influences, the dangers to the still-sleeping humans start to become reality.

The Sontaran Experiment by Bob Baker and Dave Martin, directed by Rodney Bennett
The Doctor agrees to transmat down to Earth to make sure everything is okay before the Nerva survivors begin to reclaim their planet. There, the time travellers discover the presence of a Sontaran named Styre, who is performing cruel tests on a band of captive humans. Styre's goal is to discover the weaknesses of the human body -- weaknesses the Sontarans will then exploit in
their quest to dominate the universe. (Working Title: The Destructors.)

Genesis Of The Daleks by Terry Nation, directed by David Maloney
The Time Lords intercept the companions as they transmat back to Nerva, and send them to Skaro in the distant past in order to prevent the existence of the Daleks. There they discover that planet's two native races, the Kaleds and the Thals, nearing the climax of the Thousand Year War. As the conflict reaches its terrible conclusion, Sarah discovers a disfigured Kaled scientist named Davros has already accomplished what they were sent to stop -- the Daleks have been created. (Working Title: Daleks-- Genesis Of Terror.)

Revenge Of The Cybermen by Gerry Davis, directed by Michael E Briant
The time travellers return to the Nerva Beacon, but thousands of years before they left. Whilst awaiting the arrival of the TARDIS, they discover the Beacon -- at this point in time used to direct interstellar traffic -- is overrun by a plague which has wiped out most of the crew. The culprits are the Cybermen, on a vendetta to destroy the deciding factor in humanity's war against them: Voga, the Planet of Gold. (Working Title: Return Of The Cybermen.)

Terror Of The Zygons by Robert Banks Stewart, directed by Douglas Camfield
The Brigadier summons the Doctor back to Earth to investigate mysterious goings-on around Loch Ness in Scotland. The companions discover that the Loch Ness Monster is no myth -- in fact, it is really the Skarasen, a cybernetic reptile used as a servant by shape-shifting aliens known as the Zygons. The Zygons are paving the way for an invasion by their race, fleeing the destruction of their home planet, and have already used their powers to infiltrate the local authorities.
At the story's end, Harry decides to stay behind on Earth. (Working Titles: Loch Ness, The Secret Of The Loch, The Secret Of Loch Ness, The Loch Ness Monster, The Zygons.)

Planet Of Evil by Louis Marks, directed by David Maloney
The Doctor and Sarah land on Zeta Minor, at the very edge of the universe. A scientific team led by Professor Sorenson is being terrified by an anti-matter monster, a situation which intensifies when Sorenson takes a sample of anti-matter off-planet. The Doctor must stop Sorenson, who has begun mutating into a Jekyll-and-Hyde-like anti-man, and restore the balance on Zeta Minor before death comes calling for them all.

Pyramids Of Mars by Lewis Griefer, directed by Paddy Russell
It is the 1920s, and the TARDIS lands in the home of sibling scientists Laurence and Marcus Scarman. Laurence desperately needs the Doctor's help, since his brother has been behaving very oddly ever since returning from an archaeological dig in Egypt. To confuse matters further, Laurence has begun detecting strange radio signals from the surface of Mars. The Doctor discovers that Marcus has become the avatar on Earth of Sutekh, a powerful alien Osiran imprisoned on Mars centuries earlier by his people for his terrible crimes. Now Sutekh is using Marcus to regain his freedom, and herald the end of the world. (Working Title: Pyramid Of Mars.)

The Android Invasion by Terry Nation, directed by Barry Letts
The TARDIS seems to have returned the time travellers to modern-day England, but it quickly becomes apparent that something is very wrong -- the people behave oddly, the calendar has just one day on it, coins are all minted from the same date. They soon realize they are not on Earth at all, but on a simulacrum created by the Kraals, who are using the replicated village to help them prepare for their imminent invasion of Earth. (Working Titles: The Enemy Within, Return To Sukannan, The Kraals.)

The Brain Of Morbius by Robin Bland, directed by Christopher Barry
The Time Lords divert the TARDIS to Karn, home of the Sisterhood of the Flame, whose sacred flame -- which provides an elixir granting them eternal life and used by the Time Lords to aid regenerative crises -- is slowly dying. The Sisterhood believes the Doctor has come to steal the remnants of the elixir and has him captured. Also on Karn, meanwhile, is the mad Doctor
Solon, who has covertly taken possession of the brain of Morbius, an evil Time Lord thought to have been executed. Solon is trying to build a new body for Morbius, and is lacking only the head of a Time Lord -- like the Doctor.

The Seeds Of Doom by Robert Banks Stewart, directed by Douglas Camfield
An Antarctic expedition unearths two pods which the Doctor recognises as Krynoids. Once germinated, the pods will infect humans, turning them into giant carnivorous plants which will quickly overrun the world. The Doctor manages to destroy one Krynoid, but the other is stolen by an insane botanist named Harrison Chase, who intends to use the alien entity to help plants
take over the world.

The Masque Of Mandragora by Louis Marks, directed by Rodney Bennett
The TARDIS accidentally transports the malevolent Mandragora Helix to Earth during the Renaissance in Italy. Gaining the loyalty of the twisted astrologer Hieronymous, the Helix plans nothing less than returning the Earth to the Dark Ages by murdering the great thinkers of the 15th century. (Working Titles: The Catacombs Of Death, The Curse Of Mandragora, Secret Of The Labyrinth.)

The Hand Of Fear by Bob Baker and Dave Martin, directed by Lennie Mayne
A calcified hand unearthed in the demolition of a quarry leads to Sarah's mind being taken over by an alien called Eldrad, destroyed by his people centuries earlier. Eldrad compels Sarah to break into a nuclear reactor, where he is able to regenerate his entire body. He then convinces the Doctor to return him to his home world of Kastria, from which he says he was wrongly exiled. But the Doctor and Sarah Jane are aware that there is far more to Eldrad than he claims. At the end of the story, the Doctor receives an urgent summons to Gallifrey and must leave Sarah behind on Earth. (Working Titles: The Hand Of Time, The Hand Of Death.)

The Deadly Assassin by Robert Holmes, directed by David Maloney
The President of the High Council of the Time Lords is assassinated, and the Doctor, newly returned to Gallifrey, is the prime suspect. But the Doctor knows someone is framing him, and must rely on the help of the reluctant Castellan Kelner to unveil a traitor in the High Council. Ultimately, the trail leads to the dying, vengeful Master, who wishes to harness the powers of
Rassilon's greatest discovery, the mythical Eye of Harmony. But to do so would mean the destruction of Gallifrey, and to prevent this, the Doctor must risk his life in the surreal landscape of the Matrix. (Working Title: The Dangerous Assassin.)

The Face Of Evil by Chris Boucher, directed by Pennant Roberts
The TARDIS lands on a planet where the population is divided into two warring factions, the barbaric Sevateem, and the brilliant Tesh. The Doctor himself is regarded as a demon by the Sevateem, and to the Time Lord's consternation, he discovers that a giant bust of the Evil One is in fact a replica of his own visage. With the help of a Sevateem warrior named Leela, the
Doctor discovers that the Sevateem god, Xoanon, is in fact a schizophrenic computer, whose malfunction can be traced back to the Doctor himself. At the story's conclusion, Leela leaves with the Doctor. (Working Titles: The Tower Of Imelo, The Day God Went Mad.)

The Robots Of Death by Chris Boucher, directed by Michael E Briant
The TARDIS brings the Doctor and Leela to a Sandminer, a giant mining ship. The crew of the Sandminer is slowly being killed off one by one, and the time travellers are obvious suspects. But the Doctor begins to discover the impossible is coming true--the Sandminer's robots are responsible for the deaths, and have fallen under the influence of the crazed scientist Taren Capel,
who wishes to supplant the human race with his robotic creations. (Working Title: The Storm-Mine Murders.)

The Talons Of Weng-Chiang by Robert Holmes, directed by David Maloney
The companions find themselves in Victorian London. Girls are being kidnapped off the street, ghosts have been sighted in the opera house run by Henry Jago, and giant rats haunt the London sewers. At the center of the chaos is a mysterious Oriental magician named Li H'sen Chang. Chang serves a man he believes is the god Weng-Chiang, and is searching for a cabinet lost
by his master. The Doctor uncovers the truth, however -- Weng-Chiang is actually Magnus Greel, a tyrant from the 60th century whose escape back through from that century have transformed him into a disfigured monster. (Working Titles: The Foe From The Future, The Talons of Greel.)

Horror Of Fang Rock by Terrance Dicks, directed by Paddy Russell
The TARDIS materializes near a lighthouse in the English Channel, where a boat carrying several high-society passengers has just capsized. The lighthouse itself is experiencing problems, however, with mysterious energy drains and the death of one of its technicians. The Doctor discovers that a shapeshifting Rutan has infiltrated the lighthouse and is about to summon its mothership to Earth. As the lighthouse's occupants are killed off one by one, it slowly dawns on the Doctor that, this time, he may be too late to save anyone. (Working Titles: Rocks Of Doom, The Monster Of Fang Rock, The Beast Of Fang Rock.)

The Invisible Enemy by Bob Baker and Dave Martin, directed by Derrick Goodwin
A parasite infects the Doctor whilst the TARDIS is hovering in space, and slowly takes over his mind. While the Doctor places himself in a coma to stall the parasite, Leela takes the Time Lord to a medical port on Titan in the far future. There, with the help of Professor Marius and his robot dog K-9, she has miniaturized clones of herself and the Doctor created, so that they can travel into the Doctor's mind and battle the parasite on its own level. K-9 leaves Titan with the Doctor and Leela at the adventure's conclusion. (Working Titles: The Enemy Within, The Invisible
Invader.)

Image Of The Fendahl by Chris Boucher, directed by George Spenton-Foster
The activation of a time scanner sends the Doctor, Leela and K-9 to modern-day Earth, where a team of scientists has uncovered an ancient skull. The skull is that of the Fendahl, a creature which thrives on death and which was thought to have been destroyed by the Time Lords. One of the scientists, Thea Ransome, is converted into a host for the Fendahl, and she creates minions, the deadly Fendahleen, to deliver her lethal message across the planet.

The Sunmakers by Robert Holmes, directed by Pennant Roberts
The TARDIS lands on Pluto in the far future, where the Doctor is astonished to find the planet inhabited by humans and heated by a number of miniature suns. The companions discover that the human race has been moved off Earth to do the bidding of the Company, a ruthless intergalactic conglomerate. It is up to the Doctor to uncover the secret of the Company's head, the Collector, while Leela is sentenced to death by steaming.

Underworld by Bob Baker and Dave Martin, directed by Norman Stewart
The TARDIS materializes in a spacecraft of the Minyans, a race who destroyed themselves using technology given to them by early Time Lords. Now the Minyans are on a desperate search for their lost race banks, lost centuries earlier, which are the only hope for their civilization. With the Doctor's help, the race banks are located, but the time travellers and Minyans must confront an insane computer and its robotic servants, or the Minyan race will be forever doomed. (Working Title:Underground.)

The Invasion Of Time by David Agnew, directed by Gerald Blake
The Doctor returns to Gallifrey, having become President of the High Council following an illicit deal with aliens known as the Vardans. He has Leela exiled to the wilds beyond the Capitol, where she allies herself with outcast Time Lords living as savages. Leela believes the Doctor has turned traitor, but in fact the Doctor is masterminding an elaborate plan to unveil the identity of the Vardans' masters, and foil a scheme to invade Gallifrey itself. At the end of the story, Leela remains behind to marry a Chancellery Guard named Andred; K-9 stays with her but the Doctor has already constructed a Mark II version which he subsequently activates.

The Ribos Operation by Robert Holmes, directed by George Spenton-Foster
The Doctor is called upon by the White Guardian, the embodiment of goodness and light, to find the six disguised segments of the Key To Time, scattered throughout time and space, so that the Guardian can restore the unstable universal balance. To this end, the White Guardian provides the Doctor with a new assistant in the form of the young Time Lady Romana. Their first destination is Ribos, a medieval-style planet which a con man named Garron is trying to sell to the megalomaniacal Graff Vynda K. When the Graff uncovers Garron's treachery, the crook's assistant, Unstoffe, flees into the monster-infested Catacombs, little realizing that amongst his possessions is the first segment of the Key To Time. Romana becomes the Doctor's regular travelling companion at the start of this story. (Working Titles: The Galactic Conman, Operation, The Ribos File.)

The Pirate Planet by Douglas Adams, directed by Pennant Roberts
Next the two Time Lords head to the planet Calufrax in search of the second segment. Instead, however, the TARDIS lands on Zanak, which the Doctor discovers is a pirate planet, materializing around other worlds and reaping their mineral wealth. The leader of this operation is the crazed Captain, who is prepared to take Zanak onto its next conquest: the Earth.

The Stones Of Blood by David Fisher, directed by Darrol Blake
The quest for the third segment takes the TARDIS to modern-day Earth, near a stone circle called the Nine Maidens. The circle has been a site of renewed worship of the Druidic goddess the Cailleach, as well as the researches of scientist Amelia Rumford. When someone tries to kill Romana, the Doctor realizes something is amiss at the Nine Maidens, and that the Cailleach may not be quite as mythical a goddess as he first suspected. (Working Titles: The Nine Maidens, The Stones Of Time.)

The Androids Of Tara by David Fisher, directed by Michael Hayes
While the Doctor takes a break, Romana finds the fourth segment on Ribos, only to be kidnapped by the villainous Count Grendel. It transpires that Romana is an exact double of Tara's Princess Strella. Grendel has aspirations to the Taran throne, and has kidnapped Strella in an attempt to force her to marry him; now he believes he can make Romana pose as Strella and accomplish the deception that way. But the Doctor allies himself with Reynart, Strella's true love, in a desperate attempt to stop the throne from falling into Grendel's cruel grasp. (Working Titles: The Androids Of Zenda, The Androids Of Zend, The Seeds Of Time.)

The Power Of Kroll by Robert Holmes, directed by Norman Stewart
For the fifth segment, the TARDIS takes the Doctor, Romana and K-9 to the marsh moon of Delta Magna. There, the time travellers become enmeshed in tensions between the barbaric native Swampies, the gun- runner Rohm Dutt, and the crew of a refinery which is trying to drive the Swampies away. In the midst of all this, the Swampie god, a gargantuan squid named Kroll,
is beginning to stir, and even the Doctor will be defenseless in the wake of the destruction Kroll will cause. (Working Titles: The Moon Of Death, The Horror Of The Swamp, The Shield Of Time.)

The Armageddon Factor by Bob Baker and Dave Martin, directed by Michael Hayes
The Black Guardian, the embodiment of evil and darkness, is closing in as the Doctor goes in search of the sixth and final segment on the wartorn planet Atrios. Atrios is in a state of perpetual conflict with its neighbor, Zeos, and the planet's entire civilization is being held together only through the tireless efforts of Princess Astra. But it soon becomes clear that there is more
to the Atrios/Zeos war than meets the eye, and discovering the key to the mystery may become the deciding factor in the Doctor's quest for the Key To Time. (Working Title: Armageddon.)

Destiny Of The Daleks by Terry Nation, directed by Ken Grieve
Having installed a Randomizer to avoid the attentions of the Black Guardian, the Doctor and the newly-regenerated Romana find themselves on a bleak planet the Doctor is sure he has visited before. The two are separated in a cave-in, however, and Romana finds herself a captive of the Doctor's oldest foes, the Daleks. The Doctor encounters the Daleks' enemies, the ruthless
android Movellans, who reveal that this is indeed Skaro, and the Daleks are searching for their long-long creator, Davros, in an attempt to tip a stalemate in the Dalek-Movellan war. Romana regenerates at the beginning of this story.

City Of Death by David Agnew, directed by Michael Hayes
In modern-day Paris, the Doctor and Romana realize someone is playing with time. They trace the disturbances to a Count Scarlioni, who is actually one of several fragments of an alien Jagaroth named Scaroth. Scaroth's ship exploded on primordial Earth, scattering shards of him across time. Now Scaroth has accumulated the funds and technology to send himself back in time to prevent the explosion -- but to do so would prevent the evolution of life on Earth, which was started by the explosion. (Working Titles: The Gamble With Time, Curse Of The Sephiroth.)

The Creature From The Pit by David Fisher, directed by Christopher Barry
The planet Chloris is plentiful in vegetation but barren of metal. When the time travellers arrive, Chloris' leader, the wicked Adrasta, has the Doctor thrown into a pit at the bottom of which an enormous green monster is supposed to dwell. The Doctor discovers the monster is actually Erato, an ambassador from Tythonus who came to Chloris to trade metal for agriculture,
banished to the pit because Adrasta feared losing her monopoly on metal. But the revelation may come too late, as the Tythonians are en route to Chloris, ready to ravage the planet in return for its treatment of their ambassador.

Nightmare Of Eden by Bob Baker, directed by Alan Bromley
Two spaceships collide in hyperspace, fusing the ships. Investigating the accident, the Doctor meets Tryst, an eccentric scientist who is carrying samples of various planets in a machine of his. The machine malfunctions, however, unleashing monstrous Mandrels onto both ships. Meanwhile, the time travellers discover that someone on board has been smuggling the illicit, addictive drug vraxoin -- and the series of events is most certainly not unrelated. (Working Title: Nightmare Of Evil.)

The Horns Of Nimon by Anthony Read, directed by Kenny McBain
Romana is kidnapped in space by a brutish captain transporting young Anethans to Skonnos, where they will be sacrificed to the bull-like Nimon. The Skonnans believe that the Nimon will bring their planet great prosperity but, with the help of two escaped Anethans, the Doctor learns they are actually intergalactic locusts, ravaging each world foolish enough to believe their lies.

Shada by Douglas Adams, directed by Pennant Roberts
Whilst visiting the Doctor's old friend, a retired Time Lord named Professor Chronotis living as a professor in Cambridge, the time travellers encounter the evil scientist Skagra, who has come to Earth to steal a Gallifreyan text in Chronotis' possession. With the book, Skagra can locate Shada, the old Gallifreyan prison planet, where he intends to force Salyavin, a Time Lord criminal with vast mind powers, to help him imprint his mind upon every being in the cosmos. To this end, he kidnaps Romana and the TARDIS and kills Chronotis; left with no companion and no time machine, the Doctor is forced to ally himself with two students to stop Skagra's mad scheme. (Working Title: Sunburst. This story was never completed due to a BBC strike; the finished material was released on video with narrating links by Tom Baker.)

The Leisure Hive by David Fisher, directed by Lovett Bickford
In search of a holiday, the TARDIS goes to the famous Leisure Hive on Argolis, a planet ravaged by a nuclear war with the Foamasi years earlier. The main attraction of the Hive is a device called the Tachyon Recreation Generator, but when things start to go mysteriously wrong with the machine, the Doctor realizes evil is afoot in the Hive. He and Romana begin to unearth a tangled conspiracy which may lead to a new, deadlier war between the Argolins and the Foamasi. (Working Title: The Argolins.)

Meglos by John Flanagan and Andrew McCulloch, directed by Terence Dudley
The Doctor is called back to the planet Tigella, where the population is divided along religious and scientific lines. Something is going terribly wrong with Tigella's main power source, the Dodecahedron, but before the Doctor can solve the problem, he is accused of its theft. The true culprit is Meglos, a shapeshifting Zolfa-Thuran, who intends to unleash the full power of the
Dodecahedron upon the world. (Working Titles: The Last Zolfa-Thuran, The Golden Pentangle.)

Full Circle by Andrew Smith, directed by Peter Grimwade
Romana is recalled to Gallifrey, but en route the TARDIS is drawn through a Charged Vacuum Emboitment into another universe, E-Space. Landing on the planet Alzarius, the Doctor meets a group humans who are trying to rebuild their spacecraft, which crashlanded generations ago, so they can return to their native Terradon. When Marshmen begin rising from the swamps during the dreaded time of Mistfall, however, the Doctor realizes there is something amiss on Alzarius, and begins to unravel a genetic riddle which stretches back centuries. Adric stows away on board the TARDIS at the end of the adventure. (Working Title: The Planet That Slept.)

State Of Decay by Terrance Dicks, directed by Peter Moffatt
Still trapped in E-Space, the TARDIS materializes on a medieval planet governed by the Three Who Rule, who keep the townsfolk in a grip of fear. When Romana and Adric are captured, the Doctor teams up with a band of renegade peasants, and discovers the Three Who Rule are vampires, preparing to resurrect one of the greatest enemies the Doctor's people have ever
faced. (Working Titles: The Vampire Mutations, The Wasting.)

Warriors' Gate by Steve Gallagher, directed by Paul Joyce
Trying to escape from E-Space, the time machine instead lands in an eerie white void whose only feature is a crumbling old keep. Also trapped in the void is a privateering ship captained by the cruel Rorvik whose time sensitive pilot, the leonine Tharil, Birok, escapes and lures the Doctor into the keep and the mirror gateway beyond. There, the Doctor witnesses the rise and fall
of the Tharil Empire. He realizes he must free the Tharils enslaved on the privateering ship and escape through the gateway, before Rorvik's vengeful actions destroy them all. At the end of the story, Romana and K-9 decide to remain in E-Space to help free other captured Tharils. (Working Title:Dream Time.)

The Keeper Of Traken by Johnny Byrne, directed by John Black
The Union of Traken is governed by a Keeper gifted with the powers of the Source. The current Keeper is nearing the end of his thousand-year lifetime, however, and asks the Doctor and Adric -- now back in our own universe of N-Space -- to go to Traken to stop an evil he is aware is plotting to destroy the Union. The source of the evil, the Melkur, has already infiltrated the
Consuls of Traken, however, and has the Doctor declared a criminal. Allying himself with Consul Tremas and his daughter, Nyssa, the Time Lord must discover the true power behind the Melkur -- a power who knows the Doctor of old.

Logopolis by Christopher H Bidmead, directed by Peter Grimwade
When the Doctor goes to Logopolis, planet of mathematicians, to fix the TARDIS' chameleon circuit, he instead falls into a trap by the Master. The evil Time Lord wants the secret of Logopolis' replica of Earth's Pharos Project radio telescope but instead succeeds in unleashing a wave of entropy which will consume the entire universe. The Doctor and the Master enter into an
uneasy alliance and must rely on the help of only Adric, Nyssa, and an airline stewardess named Tegan Jovanka whose aunt was murdered by the Master. But then in the moment of greatest crisis, the Master unveils his trump card, which may lead to either universal domination... or universal destruction. The Fourth Doctor, now joined by both Nyssa and Tegan, falls from the Pharos Project telescope at the story's end and regenerates.