The Fifth Doctor (1982-1984)
Season Nineteen 
(1982) Season Nineteen (1982): Mortal Reminders
Adric is the first long-running companion to die.
Season Twenty 
(1983) Season Twenty (1983): Old Ghosts
First appearances of Turlough and Kamelion.
Special 
(1983) Special (1983): Many Happy Returns
The twentieth-anniversary telefilm.
Season Twenty-One 
(1984) Season Twenty-One (1984): Violent Times
First appearance of Peri.

Season Nineteen (1982): Mortal Reminders

The Doctor
The Fifth Doctor

Peter Davison played the Doctor from Logopolis in March 1981 to The Caves Of Androzani in March 1984. He returned for Dimensions In Time in November 1993 and Time Crash in November 2007.

The Production Team

When Christopher Bidmead left Doctor Who at the end of its eighteenth season, there was no one immediately available to replace him on a permanent basis. Antony Root was brought into the position on a temporary three-month basis, but it was not until John Nathan-Turner started searching for scripts that an ideal replacement came in the form of new scriptwriter Eric Saward, who had already been commissioned for the upcoming season. After a three-month trial period, Saward became Doctor Who's permanent script editor.

The Stories
Castrovalva
Castrovalva by Christopher H Bidmead, directed by Fiona Cumming
While the 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 soon find themselves arriving on Castrovalva, a place legendary for its serene atmosphere. There they hope that the Doctor will be able to recuperate from his recent trauma. But the Master is lurking on Castrovalva, and it soon becomes clear that he has drawn the time travellers into a trap from which there may be no escape.
Four To 
Doomsday
Four To Doomsday by Terence Dudley, directed by John Black
Trying to get Tegan home, the Doctor instead lands the TARDIS on a spaceship heading towards Earth. Its owner, the frog-like Monarch, has visited Earth four times in the past, kidnapping specimens of human culture on each occasion. His true goal, however, is to find a way to travel faster than light, thereby going back to the beginning of time where he hopes to meet God, whom he believes is actually himself. In pursuit of this aim, he has exhausted the resources of his home planet, Urbanka. Now he intends to transplant the Urbankans to Earth -- and eradicate humanity to make room for his people.
Kinda
Kinda by Christopher Bailey, directed by Peter Grimwade
The TARDIS brings the Doctor, Adric, Nyssa and Tegan to the idyllic jungle world of Deva Loka, which is being surveyed for possible Earth colonisation. Deva Loka is already home to a race of apparent savages, however: a mysterious people with strange powers which have mentally unbalanced the members of the expedition. To make matters worse, an ancient enemy of the natives -- a serpentine being called the Mara -- still lurks on Deva Loka. The Mara is intent upon revenge, and latches onto Tegan's mind as its bridgehead to victory.
The 
Visitation
The Visitation by Eric Saward, directed by Peter Moffatt
It is the year 1666, and the Great Plague is rampant throughout England. The Doctor, Adric, Nyssa and Tegan discover that aliens -- the Terileptils -- are operating in a small village. 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 learns that the Terileptils intend to rid the Earth of humanity, and have amassed an army of plague-carrying rats to help them finish the deed.
Black 
Orchid
Black Orchid by Terence Dudley, directed by Ron Jones
The Doctor, Adric, Nyssa and Tegan 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 that Charles Cranleigh's fiancee, Ann Talbot, is her exact double. The Cranleighs harbour 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 attempts to kidnap her... but takes Nyssa by mistake.
Earthshock
Earthshock by Eric Saward, directed by Peter Grimwade
In the 26th century, the Doctor, Adric, Nyssa and Tegan come to the aid of a platoon of soldiers, which is investigating the murder of a scientific team in a cave complex on Earth. The Doctor discovers that the killers are actually androids serving the Cybermen, and are guarding a bomb intended to destroy the planet. The Doctor disarms the explosive but by tracing the detonation signal, he learns that the greatest danger is yet to come. The Cybermen have secreted themselves on board a freighter heading for Earth, which will unknowingly serve as the bridgehead for a massive invasion.
Adric perishes while stopping the Cybermen from destroying the Earth.
Time-Flight
Time-Flight by Peter Grimwade, directed by Ron Jones
When a Concorde disappears, the Doctor discovers that it has been hijacked back through time to the Pleistocene Era. Arriving there, he, Nyssa and Tegan find that Concorde's crew and passengers have been enslaved by the sinister Kalid, who is forcing them to excavate a sanctum within a mysterious citadel. Entombed within is the consciousness of a gestalt race called the Xeraphin, who possess devastating mental powers. The Doctor learns that Kalid is really the Master, who plans to harness the evil side of the Xeraphin in order to wreak havoc throughout the cosmos.

Making History

For the first time ever, Doctor Who was moved out of its traditional Saturday evening timeslot and aired instead twice-weekly -- on both Tuesday and Wednesday nights -- during Season Nineteen. This move was prompted by a drastic drop in ratings the previous year, an erosion which saw significant reversal with the new scheduling and the new Doctor.

Season Twenty (1983): Old Ghosts

Companions and Recurring Characters

Vizlor Turlough was an alien from the planet Trion who was imprisoned on Earth, and became a member of the TARDIS crew while acting as an agent of the sinister Black Guardian.

Mark Strickson played Turlough from Mawdryn Undead in February 1983 to Planet Of Fire in March 1984. He returned as a regenerative image for The Caves Of Androzani in March 1984.

Vizlor Turlough

Kamelion was a shape-shifting android whom the Doctor rescued from the clutches of the Master.

Kamelion appeared in The King's Demons in March 1983 and Planet Of Fire in February and March 1984, and as a regenerative image in The Caves Of Androzani in March 1984. Its default voice was provided by Gerald Flood.

Kamelion

The Stories
Arc Of 
Infinity
Arc Of Infinity by Johnny Byrne, directed by Ron Jones
The Doctor's bio-data extract is stolen from the Matrix on Gallifrey. Soon after, a being from an anti-matter universe begins to genetically bond with the Doctor. He and Nyssa return to Gallifrey, only for the High Council to order his execution -- while on Earth, unbeknownst to her friends, Tegan's search for her missing cousin in Amsterdam is somehow tied into the events as well. It is left to Nyssa to uncover the identity of a traitor on the High Council, and to unveil the enemy manipulating the Doctor -- an entity who has long thirsted for revenge against both the Doctor and the Time Lords themselves.
Snakedance
Snakedance by Christopher Bailey, directed by Fiona Cumming
The Mara once again takes control of Tegan's mind and compels her to direct the TARDIS to Manussa, seat of its once-mighty empire. Generations earlier, the Mara was driven off Manussa with the use of the Great Crystal, a device which enhances its users' mental abilities. Now, the Mara intends to use the Crystal to return to power. It is up to the Doctor to unearth the terrible origins of the Mara, and seek out the one man who can show him how to defeat the Mara in psychic combat.
Mawdryn 
Undead
Mawdryn Undead by Peter Grimwade, directed by Peter Moffatt
An alien named Turlough lives in secret amongst boys at an English boarding school where the Brigadier is now teaching maths. He is contacted by the Black Guardian, who wants him to kill the Doctor. The TARDIS, meanwhile, has brought the Doctor, Nyssa and Tegan to a space station trapped in a warp ellipse. It serves as a 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.
Under orders from the Black Guardian, Turlough leaves with the Doctor in the TARDIS.
Terminus
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 long ago, an event which instigated the Big Bang and the creation of the universe. Now the other engine is on the brink of detonating as well -- an event which will have cataclysmic consequences for the cosmos.
Nyssa decides to stay on Terminus to help treat the Lazar victims.
Enlightenment
Enlightenment by Barbara Clegg, directed by Fiona Cumming
Under the failing influence of the White Guardian, the TARDIS materialises on what appears to be an Edwardian racing yacht. It is soon revealed to be a cleverly disguised spacecraft, competing in an interplanetary race. The competitors are Eternals, immortal beings incapable of imagination or creative thought, while the crew are mortals, upon whose minds the Eternals draw for inspiration. 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 
King's Demons
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, involved in the events which will lead to the signing of the Magna Carta. The time travellers discover that the King is not who he claims -- in fact, he is a shapechanging robot named Kamelion under the influence of the Master, who is trying to irreversibly pervert the course of Earth's history.
The Doctor takes Kamelion with him in the TARDIS.

Making History

Each story of Season Twenty sees the return of an element of Doctor Who's past, a coincidence noticed by Ian Levine -- who was then acting as the programme's unofficial fan adviser -- and used for publicity purposes by John Nathan-Turner. Characters brought back from previous years included Omega, the Mara, the Brigadier (whose role in Mawdryn Undead was originally written for Ian Chesterton and then Harry Sullivan), the Black and White Guardians, the Master and -- before industrial action forced the postponement of the story until Season Twenty-One -- the Daleks.

Special (1983): Many Happy Returns

The Story
The Five 
Doctors
The Five Doctors by Terrance Dicks, directed by Peter Moffatt
While the Fourth Doctor and Romana are trapped in a time eddy, the First, Second, Third and Fifth Doctors -- together with many of their companions -- are lured by a mysterious figure to the forbidden Death Zone on Gallifrey. There they make their way towards the Dark Tower in which Rassilon is entombed, encountering a number of their deadliest foes en route. When the Fifth Doctor finds a way to teleport himself to the Capitol, however, he uncovers evidence of a traitor on the High Council. All are embroiled in the Game of Rassilon, whose prize is immortality itself.

Making History

Celebrating Doctor Who's twentieth anniversary, The Five Doctors was screened as a telefilm independently of the series' regular seasons, eight months after the conclusion of Season Twenty. The special episode featured all five Doctors (although Tom Baker appeared only in clips from Shada and the late William Hartnell in a clip from The Dalek Invasion Of Earth, his role in the story proper taken over by Richard Hurndall), eleven companions (Susan, the Brigadier, Jamie, Zoe, Mike Yates, Liz, Sarah Jane, the Second Romana -- also in Shada clips) -- K·9 Mark III, Tegan and Turlough) and four old villains (the Master, the Cybermen, a Dalek, a Yeti), plus of course the Time Lords themselves.

Season Twenty-One (1984): Violent Times

Companions and Recurring Characters

Perpugilliam (Peri) Brown was an American college student who became embroiled in the Master's scheme to seize the power of the numismaton flames on the planet Sarn.

Nicola Bryant played Peri from Planet Of Fire in February 1984 to The Trial Of A Time Lord in October 1986. She returned for Dimensions In Time in November 1993.

Peri Brown

The Stories
Warriors Of 
The Deep
Warriors Of The Deep by Johnny Byrne, directed by Pennant Roberts
The TARDIS materialises in a seabase in the year 2084. Earth in the late 21st century is divided between two power blocs waging a bitter cold war, forever threatening to escalate into violent conflict. Mysterious accidents have been occurring on the seabase, including the deaths of key personnel. Investigating, the Doctor, Tegan and Turlough 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 decimate humanity.
The 
Awakening
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 from the English Civil War, including skirmishes which took place near the town. But the recreations have revived the Malus, an alien entity buried beneath a ruined church which feeds on the passions inflamed by war and death. Time is becoming distorted while Hutchinson -- who has fallen under the Malus' influence -- works to set the creature free, putting Tegan's life at risk in the process.
Frontios
Frontios by Christopher H Bidmead, directed by Ron Jones
The TARDIS arrives 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 prominent colonists who have been sucked down beneath the ground. The Doctor, Tegan and Turlough discover that the culprits are the Gravis and his Tractators, giant insects with incredible powers over gravity. The Gravis intends to transform Frontios into an enormous spaceship, and spread the terror of the Tractators across the galaxy.
Resurrection 
Of The Daleks
Resurrection Of The Daleks by Eric Saward, directed by Matthew Robinson
The Doctor, Tegan and Turlough are nearly torn apart in a Dalek time corridor which connects a warehouse on modern-day Earth with 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 force him to create an antidote. Once successful, the Daleks will at last be in a position to destroy the Movellans and rampage across the cosmos.
Tired of all the death and violence she has witnessed, Tegan remains on Earth.
Planet Of 
Fire
Planet Of Fire by Peter Grimwade, directed by Fiona Cumming
Turlough rescues a drowning botany student named Peri Brown and brings her to the TARDIS to recuperate. Before Peri can bid her farewells, 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 a mishap with his tissue compression eliminator, and restore him using the healing properties of Sarn's miraculous numismaton flames. But Sarn hides a mysterious connection to Turlough's past -- a connection which may prove to be the catalyst in the Master's scheme.
Turlough returns to his home planet, and the Doctor destroys Kamelion at the robot's request. Peri travels on in the TARDIS.
The Caves Of 
Androzani
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 rebuffs 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.

Making History

After a period of relative stability, Doctor Who saw a complete turnaround in its cast over the three-story period ranging from Resurrection Of The Daleks to The Caves Of Androzani, with Janet Fielding, Mark Strickson and Peter Davison all leaving the show. The Kamelion robot was also hastily written out when the death of its inventor -- the only person who really knew how to operate the machine -- meant that its continued use in Doctor Who was unfeasible. Davison had always intended to stay for just three seasons, but the quality of scripts for Season Twenty-One prompted him to reconsider. This change of heart came too late, however; the Sixth Doctor had already been cast, and Doctor Who would be reinvented once again.