Castrovalva by Christopher H Bidmead, directed by Fiona Cumming
While the Fifth Doctor retreats to the TARDIS Zero Room to recover from his regeneration, the Master kidnaps Adric and sends the TARDIS hurtling back in time to the Big Bang, where it will be torn apart. Tegan and Nyssa manage to save the time machine, and find themselves on Castrovalva, a place legendary for its relaxing nature. But there is a serpent in this Paradise,
and discovering its identity may be the only chance to recover Adric from the Master's clutches. (Working Title: The Visitor.)

Four To Doomsday by Terence Dudley, directed by John Black
Trying to get Tegan back to modern-day Earth, the Doctor instead lands the TARDIS on a spaceship owned by the frog-like Monarch heading towards the Earth. Monarch has visited Earth four times in the past, capturing specimens of our planet's culture each time. His true goal, however, is to find a way to travel faster than light, thereby going back in time where he hopes
to meet God, whom he thinks is himself. To do this, however, he has exhausted the resources of his home planet, Urbanka. Now he intends to transplant the Urbankans to Earth -- and kill off the humans to make room for his people. (Working Title:Day Of Wrath.)

Kinda by Christopher Bailey, directed by Peter Grimwade
The TARDIS brings the Doctor, Adric, Nyssa and Tegan to the idyllic world of Deva Loka, which is being considered for colonization by Earth. To do so, however, would mean dealing with the natives, savages with mysterious powers who have mentally unbalanced the scientific team sent to investigate Deva Loka. Tegan, meanwhile, has inadvertently allowed an ancient enemy of the Deva Lokans, the serpentine Mara, to invade her mind. Now the Mara intends to wreak its final revenge on Deva Loka. (Working Title: The Kinda.)

The Visitation by Eric Saward, directed by Peter Moffatt
It is the year 1666, and the Great Plague is rampant throughout England. The time travellers discover aliens, the Terileptils, have arrived on Earth. They have taken control of much of the local population and are driving away the rest using an android disguised as the Grim Reaper. With the help of unemployed thespian Richard Mace, the Doctor discovers that the Terileptils
intend to rid the planet of humans, and have amassed an army of Plague-carrying rats to help them finish the deed. (Working Titles: The Invasion Of The Plague Men, Plague Rats.)

Black Orchid by Terence Dudley, directed by Ron Jones
The companions find themselves in 1925 England, where through a case of mistaken identity they become involved in a charity cricket match at Cranleigh Halt. There, Nyssa discovers the Cranleigh's daughter, Ann, is her exact double. The Cranleighs harbor a dark family secret, however -- a hideous monster hidden in a secret wing of their house. Fixated on Ann, it breaks out during a costume ball and kidnaps her... but takes Nyssa by mistake. (Working Title: The Beast.)

Earthshock by Eric Saward, directed by Peter Grimwade
In the 25th century, the Doctor comes to the aid of a police force investigating the murder of an scientific team in a chain of caverns on Earth. The Time Lord discovers the killers are actually androids serving the Cybermen, guarding a bomb intended to destroy the planet. The Doctor disarms the bomb but soon learns that the greatest danger is yet to come -- unbeknownst to its
crew, a freighter headed for Earth is carrying the greatest army of Cybermen the universe has ever seen. Adric perishes in the story's climax, stopping the Cybermen from destroying the Earth. (Working Title: Sentinel.)

Time-Flight by Peter Grimwade, directed by Ron Jones
When a Concorde disappears, the Doctor is called upon to investigate, and finds it has been stolen back through time to the Pleistocene Era. There, the time travellers discover the Master is at work, using human slaves taken off the Concorde to help him control the evil side of the Xeraphin, whose devastating mental powers the evil Time Lord intends to use to wreak havoc
through the cosmos. (Working Title: Xeraphin.)

Arc Of Infinity by Johnny Byrne, directed by Ron Jones
The Doctor's bio-data extract is stolen from the Matrix on Gallifrey. When a being from an anti-matter universe begins to genetically bond with the Doctor, the High Council orders the renegade's execution. It is left to Nyssa to uncover the identity of the traitor on the High Council, and to unveil the enemy manipulating the Doctor; and a very old enemy it is, indeed. (Working
Title: The Time Of Neman.)

Snakedance by Christopher Bailey, directed by Fiona Cumming
The Mara once again invades Tegan's mind and compels her to take the TARDIS to Manussa, seat of its long-lost empire. Generations earlier, the Mara was driven off Manussa with the use of the Great Crystal, a powerful device which enhances its users' mental abilities. Now, the Mara intends to use the Crystal to return to being. It is up to the Doctor to unearth the terrible origins of the Mara, and search out the one man who can show how to defeat the Mara in psychic battle.

Mawdryn Undead by Peter Grimwade, directed by Peter Moffatt
The Black Guardian contacts the alien Turlough, who is living amongst boys at an English academy where the Brigadier is now teaching math. The Guardian wants Turlough to kill the Doctor. The TARDIS meanwhile, has brought the time travellers to a space station trapped in a warp ellipse. This is also the prison for a team of scientists led by Mawdryn, who tried to steal the
secrets of the Time Lords and were placed in a state of perpetual regeneration as retribution. It is up to the Doctor to find some way to help Mawdryn, but doing so may cost him his remaining regenerations. Turlough leaves in the TARDIS at the story's conclusion.

Terminus by Steve Gallagher, directed by Mary Ridge
Turlough's sabotage causes the TARDIS to make an emergency landing on a space station called Terminus, where victims of the horrible, virulent Lazar disease go to die. The Doctor discovers that Terminus is powered by two enormous engines, one of which exploded, an event which instigated the Big Bang and the creation of the universe. Now the other engine is on the brink
of exploding as well -- an event which will have cataclysmic consequences for the cosmos.
At the end of the adventure, Nyssa decides to stay on Terminus to help treat the Lazar victims.

Enlightenment by Barbara Clegg, directed by Fiona Cumming
Under the failing influence of the White Guardian, the TARDIS materializes on what appears to be an Edwardian racing yacht. It is soon revealed to be merely a replica, travelling in an enormous interplanetary space race. The competitors are Eternals, immortal beings incapable of imagination or creative thought, who man the ship with mortals, upon whose minds they draw. The prize in the race is Enlightenment, offered up by the Black and White Guardians. One of the Eternals, the vicious Captain Wrack, is in league with the Black Guardian, however, and will stop at nothing to win the race. (Working Title: The Enlighteners.)

The King's Demons by Terence Dudley, directed by Tony Virgo
The Doctor, Tegan and Turlough find themselves in 1215 England. They arrive at the castle of Ranulf Fitzwilliam, and are astounded to find King John there too, especially since he is supposed to be in London at the same time, signing the Magna Carta. The time travellers discover the King is not who he claims -- in fact, the King is shapechanging robot named Kamelion under the influence of the Master, who is trying to irreversibly pervert the course of Earth's history.
At the end of the story, the Doctor takes Kamelion with him in the TARDIS.

The Five Doctors by Terrance Dicks, directed by Peter Moffatt
A mysterious figure lures the First, Second, Third and Fifth Doctors to the forbidden Death Zone on Gallifrey, along with many of their companions. There, they travel towards the Tomb of Rassilon, encountering many of their deadliest foes along the way. When the Fifth Doctor finds a way to teleport himself to the Capitol, however, it soon becomes increasingly clear that something is very wrong -- a Time Lord traitor is manipulating the Doctors, searching for the secret of immortality possessed by Rassilon himself.

Warriors Of The Deep by Johnny Byrne, directed by Pennant Roberts
The TARDIS materializes in a seabase in the year 2084. The Earth in the late 21st century is divided between two power blocs along which a bitter cold war is raging, ever close to developing into a violent, deadly conflict. Mysterious accidents have been happening on the seabase, however, including the deaths of key personnel. Investigating, the time travellers discover that not only have double agents infiltrated the seabase, but the Doctor's old foes, the Silurians and Sea Devils, are plotting to use the seabase to set off a war which will destroy humanity.

The Awakening by Eric Pringle, directed by Michael Owen Morris
The Doctor takes Tegan to the village of Little Hodcombe to visit her grandfather. The villagers, led by Sir George Hutchinson, are reenacting events of the English Civil War which took place in the town. But the recreations have revived the Malus, an alien being buried beneath a ruined church which feeds on war and death. Hutchinson has fallen under the Malus' powers and is
working to free the imprisoned being -- an effort which sees Tegan cast as the ill-fated Queen of May. (Working Titles: War Game, Poltergeist.)

Frontios by Christopher H Bidmead, directed by Ron Jones
The TARDIS lands on the planet Frontios in the far future, where the last vestiges of humanity crashlanded years earlier. The struggling colony is beset by disasters, including deadly meteorite showers and the disappearance of several key colonists who are drawn beneath the ground. The companions discover the culprit is the Gravis and his Tractators, giant insects with incredible powers over gravity. The Gravis intends to transform Frontios into a giant spaceship; once successful, he will be able to spread the terror of the Tractators across the galaxy. (Working Title: The Wanderers.)

Resurrection Of The Daleks by Eric Saward, directed by Matthew Robinson
After nearly being torn apart in a time corridor, the time travellers discover that the Daleks are travelling between a warehouse on modern-day Earth and a spacecraft in the future. The Daleks have lost the war with the Movellans due to a virus which affects only their kind. Now, with the help of the mercenary Lytton, they intend to free the imprisoned Davros and have him create an antidote. Once successful, the Daleks will once again be in a position to destroy the Movellans and rampage across the cosmos. Tired of all the death and violence she has witnessed, Tegan leaves the Doctor at the story's conclusion. (Working Title: The Return.)

Planet Of Fire by Peter Grimwade, directed by Fiona Cumming
Turlough rescues a drowning university student named Peri Brown and returns her to the TARDIS to recuperate. Before she can bid her farewell, Kamelion, once again under the Master's control, takes the TARDIS to the planet Sarn. There, his mission is to find the Master, who has been diminished to just inches in height following an accident with his tissue compression eliminator, and restore the evil Time Lord to his full height using Sarn's remarkable numismaton flames. But Sarn has mysterious connections to Turlough's past -- connections which may prove the catalyst in the Master's plans. Turlough returns to his home planet at the end of the story, and the Doctor destroys Kamelion at the robot's request. Peri travels on with the Time Lord. (Working Title: Planet Of Fear.)

The Caves Of Androzani by Robert Holmes, directed by Graeme Harper
After landing on the planet Androzani Minor, the Doctor and Peri develop lethal spectrox toxaemia poisoning. As the two search for a cure before it is too late, they become enmeshed in a decades-old feud between the disfigured roboticist Sharaz Jek and businessman Morgus. Jek falls in love with Peri, but the situation only degenerates when the girl refuses his affections. Between threats from mire beasts and gun runners, it quickly becomes apparent that the Doctor will never find a cure in time to save both himself and his companion. His body damaged beyond repair by spectrox toxaemia, the Doctor regenerates at the story's end. (Working Title: Chain Reaction.)