The Second Doctor (1966-1969)
Season Four 
(1966-67) Season Four (1966-67): Renewal
First appearances of Jamie and Victoria.
Season Five 
(1967-68) Season Five (1967-68): Monstrous Encounters
First appearances of Zoe, Captain (later Brigadier) Lethbridge-Stewart, the Great Intelligence, the Yeti and the Ice Warriors.
Season Six 
(1968-69) Season Six (1968-69): Running Out Of Time
First appearances of Benton and UNIT. The Time Lords, named for the first time, exile the Doctor to Earth.

Season Four (1966-67): Renewal

The Doctor
The Second Doctor

Patrick Troughton (bio) made his first appearance as the Doctor in The Tenth Planet (October 1966) and his last in The Two Doctors (March 1985).

Companions and Recurring Characters

Jamie McCrimmon was a young Scottish piper who met the Doctor during the Highland uprising of 1746.

Frazer Hines (bio) made his first appearance as Jamie in The Highlanders (December 1966) and his last in The Two Doctors (March 1985).

Jamie McCrimmon

Victoria Waterfield was an orphan from 1866 England whose father was murdered by the Daleks.

Deborah Watling (bio) made her first appearance as Victoria in The Evil Of The Daleks (May 1967) and her last in Dimensions In Time (November 1993).

Victoria 
Waterfield

The Production Team

With both Innes Lloyd and Gerry Davis expressing a desire to move on from Doctor Who, Peter Bryant (bio) was added to the production team. Initially working as Davis' assistant, he was promoted to associate producer and finally story editor when Davis departed at the end of the season.

The Stories
The Power Of 
The Daleks
The Power Of The Daleks by David Whitaker, directed by Christopher Barry
Ben and Polly are still suspicious of the younger man claiming to be the Doctor, as the TARDIS lands on the colony world of Vulcan. The Doctor witnesses the murder of a newly-arrived examiner from Earth, and decides to assume the man's identity in order to investigate. He soon learns that a scientist named Lesterson has unearthed a crashed capsule containing the inert forms of three Daleks. The Doctor is horrified to discover that Lesterson has started reactivating them, intending to use them to serve the colony's populace -- ignorant of the fact that the Daleks have a far more sinister agenda. (All six episodes are missing.)
The 
Highlanders
The Highlanders by Elwyn Jones and Gerry Davis, directed by Hugh David
The TARDIS materialises in 1746 Scotland, following the defeat of the Jacobites by the Redcoats in the Battle of Culloden. The Doctor, Polly and Ben meet the McLarens and their piper, Jamie McCrimmon, who are being hunted by the English while they try to care for their wounded Laird. The men are captured by the foppish Lieutenant Algernon ffinch, who promptly sells them to Solicitor Grey. Polly becomes determined to rescue her friends, and aims to dupe ffinch into helping her. Meanwhile, the crooked Grey is planning to sell captive Highlanders as slaves in the West Indies... and Ben is to be amongst the first shipment. (All four episodes are missing.)
To save Jamie from reprisals against the Jacobites, the Doctor invites him aboard the TARDIS.
The 
Underwater Menace
The Underwater Menace by Geoffrey Orme, directed by Julia Smith
When the TARDIS lands on a volcanic island, the time travellers are kidnapped and taken through a passageway to the lost city of Atlantis. While Ben and Jamie are sent to toil in the mines, Polly is fated to undergo an operation to turn her into a water-breathing Fish Person. Meanwhile, the Doctor meets the famous scientist Professor Zaroff, who has convinced the Atlanteans that he can raise their city back above the waves. But the Doctor realises that Zaroff is insane and, if he isn't stopped, his plan to drain the ocean's waters into the planet's core will doom the Earth. (Episodes one and four are missing.)
The 
Moonbase
The Moonbase by Kit Pedler, directed by Morris Barry
The Doctor, Polly, Ben and Jamie find themselves on the Moon in the year 2070. When Jamie is injured, his friends seek help at a nearby Moonbase, which houses the weather-controlling Gravitron. However, a plague has erupted amongst its crew, and the Gravitron has started experiencing mysterious faults. Hobson, the Moonbase commander, begins to suspect that the time travellers are responsible for the crisis. But the Doctor soon discovers that the culprits are his old foes, the Cybermen, who are preparing to seize control of the Gravitron as part of a new attempt to invade the Earth. (Episodes one and three are missing.)
The Macra 
Terror
The Macra Terror by Ian Stuart Black, directed by John Davies
An Earth colony in the far future has all the look and feel of a holiday camp. Immediately after arriving, however, the TARDIS crew is confronted by a disturbed man named Medok. He warns them of monsters which have secretly infiltrated the colony, even as the Pilot dismisses his claims, insisting that there is no such thing as Macra. The Doctor believes Medok and begins to investigate, so the colony's mysterious Commander orders the time travellers to be brainwashed. While the Doctor is able to save Polly and Jamie, he is too late to prevent Ben from being turned against his friends... (All four episodes are missing.)
The 
Faceless Ones
The Faceless Ones by David Ellis and Malcolm Hulke, directed by Gerry Mill
The TARDIS materialises in 1966 London, on the runway at Gatwick Airport. In the Chameleon Tours hangar, Polly witnesses a pilot murder a police detective. But soon after she tells her friends what she saw, Polly goes missing... and when her exact double is found working at the Chameleon Tours kiosk, she denies any knowledge of the Doctor or the murder. Ben soon vanishes too, while Jamie befriends a young woman named Samantha Briggs whose brother disappeared after taking a Chameleon Tours flight. The culprits are faceless aliens, whose theft of human identities is the first step in their conquest of the Earth. (Episodes two and four through six are missing.)
Having arrived back on present-day Earth, Polly and Ben decide to stay.
The Evil Of 
The Daleks
The Evil Of The Daleks by David Whitaker, directed by Derek Martinus
When the TARDIS is stolen from Gatwick Airport, the Doctor and Jamie follow a trail of clues in an attempt to recover it, little realising that they're walking into a trap. Kidnapped by scientist Edward Waterfield, they're taken back in time to 1866. There they discover that Waterfield is the reluctant ally of the Daleks, who are holding his daughter, Victoria, hostage. The Daleks claim that they're trying to isolate the Human Factor -- that which makes mankind truly human -- and Jamie is compelled to endure a series of perilous trials to assist them. But the Doctor suspects that his old enemies have even more sinister motivations... (Episodes one and three through seven are missing.)
Orphaned by the Daleks, Victoria joins the Doctor and Jamie.

Making History

Innes Lloyd and Gerry Davis' regeneration gamble proved a success, and Doctor Who's survival was assured for the time being. Furthermore, with the Cybermen, Davis and Kit Pedler had devised a monster to rival the popularity of the Daleks. Their creations would come to dominate the Troughton era much as the mutants from Skaro had helped define William Hartnell's time as the Doctor. It was also during Season Four that Lloyd and Davis completed their reformulation of Doctor Who by eliminating historical adventures altogether; from this point onwards, virtually every Doctor Who story would exhibit some science-fiction content, moving further away from the educational remit originally envisaged by Sydney Newman.

Season Five (1967-68): Monstrous Encounters

Companions and Recurring Characters

Zoe Heriot was a brilliant astrophysicist from the twenty-first century who met the Doctor during a Cyberman invasion of the space station on which she worked.

Wendy Padbury (bio) made her first appearance as Zoe in The Wheel In Space (April 1968) and her last in The Five Doctors (November 1983).

Zoe Heriot

Alistair Gordon Lethbridge-Stewart first worked with the Doctor when he was a colonel in the British army. He was subsequently promoted to brigadier in order to head up the British division of the United Nations Intelligence Task Force (UNIT), which was established to combat alien interference on Earth.

Nicholas Courtney (bio) made his first appearance as Lethbridge-Stewart in The Web Of Fear (February 1968) and his last in Dimensions In Time (November 1993).

Brigadier 
Lethbridge-Stewart

The Production Team

Innes Lloyd's wish was finally granted midway through the season when he departed Doctor Who, leaving it in the hands of Peter Bryant. To that point, Bryant had been acting as story editor, although he had already been given a trial period as producer, during which his assistant, Victor Pemberton (bio), was promoted to story editor. However, when Pemberton decided against remaining on Doctor Who, Derrick Sherwin (bio) was hired to replace him, and became the new story editor.

The Stories
The Tomb Of 
The Cybermen
The Tomb Of The Cybermen by Kit Pedler and Gerry Davis, directed by Morris Barry
An archaeological expedition from Earth lands on the desolate planet Telos, on a mission to explore the fabled tombs to which the dying Cybermen retreated long ago. But the frozen tombs are filled with traps and, as the TARDIS arrives, one team member has already perished. The Doctor's curiosity compels him to help the scientists, even as it becomes clear that the expedition's backers -- the logicians Klieg and Kaftan -- harbour sinister motives. Soon Victoria is menaced by the silverfish-like Cybermats, while the Doctor and Jamie are trapped below ground, witnesses to the emergence of the Cybermen from their long hibernation...
The 
Abominable Snowmen
The Abominable Snowmen by Mervyn Haisman and Henry Lincoln, directed by Gerald Blake
When the TARDIS lands near the Detsen monastery in Tibet, the Doctor sets out to return a sacred ghanta, which he took with him for safekeeping centuries earlier. But when he arrives at Detsen, he is accused of murder by Travers, a British explorer who has been searching for the mythical Yeti, and whose companion has been savagely killed. The monks know of the Yeti, and believe that the Doctor is responsible for the violent tendencies they have recently displayed. Jamie and Victoria discover evidence that the Yeti are actually robots, convincing the Doctor that he must uncover the Intelligence controlling their actions. (Episodes one and three through six are missing.)
The Ice 
Warriors
The Ice Warriors by Brian Hayles, directed by Derek Martinus
The Earth is on the brink of a new Ice Age. The TARDIS arrives at Brittanicus Base in England, where a small team of scientists desperately tries to hold back the glaciers. But even as their equipment starts to fail, Leader Clent's faith in the infallibility of the Base computer's instructions remains unshakable. Meanwhile, a Brittanicus team has unearthed a reptilian figure from the glacier, which they dub an Ice Warrior. But the Ice Warrior soon revives, and reveals himself to be a Martian named Varga, whose spaceship crashlanded on Earth long ago. Varga sets out to free his dormant crew from the glacier -- no matter the cost. (Episodes two and three of this story are missing.)
The Enemy Of 
The World
The Enemy Of The World by David Whitaker, directed by Barry Letts
The Doctor, Jamie and Victoria land on Earth in the near future, where they are rescued from an attack by a woman named Astrid. She explains that the Doctor strongly resembles Salamander, a scientist who has developed a network of Sun-Catcher satellites intended to ease global hunger. But some believe that Salamander's real goal is global domination, and Astrid asks the Doctor to masquerade as his doppelganger to uncover the truth. The time travellers must navigate treachery and murder to uncover Salamander's true schemes, which are more devious than anyone suspects.
The Web Of 
Fear
The Web Of Fear by Mervyn Haisman and Henry Lincoln, directed by Douglas Camfield
In modern-day London, the Doctor, Jamie and Victoria discover that the city has been evacuated, and is now covered in mist and a weird, cobweb-like substance. In the Underground, they encounter the military and Colonel Lethbridge-Stewart, and discover that the Great Intelligence and its Yeti are active once again. Although the soldiers are being assisted by their old friend, Professor Travers, and his daughter, Anne, they have been unable to prevent the relentless advance of the Yeti. To make matters worse, the Doctor begins to suspect that one of their allies is secretly in league with the Great Intelligence... (Episode three is missing.)
Fury From The 
Deep
Fury From The Deep by Victor Pemberton, directed by Hugh David
The TARDIS lands amidst the waters of the North Sea in the modern day. Coming ashore, the Doctor, Jamie and Victoria detect the sound of a heartbeat in a pipeline connecting rigs off the coast to a nearby refinery. The time travellers learn that the refinery has been plagued by problems: the pipeline pressure keeps dropping, and there is intermittent loss of contact with the rigs. The strain is taking its toll on Robson, the head of the refinery, but his assistant, Harris, is troubled by a mysterious attack on his wife. The Doctor realises that a parasitic seaweed has invaded the pipeline, and is preparing to take control of all humanity. (All six episodes are missing.)
Victoria decides to stay behind to live with the Harrises.
The Wheel In 
Space
The Wheel In Space by David Whitaker and Kit Pedler, directed by Tristan de Vere Cole
The unmanned rocket Silver Carrier is millions of miles off course, drifting near a space station known as the Wheel. The Wheel's highly-strung commander, Jarvis Bennett, initially plans to destroy the rocket outright, but instead agrees to despatch some of his crew to investigate. When they discover the Doctor and Jamie on board the Silver Carrier, Bennett is convinced that the time travellers are saboteurs. But nobody is aware of the rocket's other passengers: the Cybermen. Using their Cybermats to wreak havoc aboard the Wheel, the Cybermen plan to use it as a stepping stone in their conquest of the Earth. (Episodes one, two, four and five are missing.)
Astrophysicist Zoe Heriot sneaks aboard the TARDIS.

Making History

Season Five would become renowned in Doctor Who history as the Year of the Monsters. As the populist science-fiction approach championed by Innes Lloyd and Gerry Davis took hold, every story bar The Enemy Of The World featured monsters: the Cybermen, the Yeti, the Ice Warriors, the Weed. Indeed, the Yeti and the Ice Warriors would join the pantheon of Doctor Who's most memorable monsters -- the former in spite of the fact that they would never star in a televised story again!

Season Six (1968-69): Running Out Of Time

Companions and Recurring Characters

John Benton was originally a UNIT corporal, later a sergeant, and finally an RSM. He worked frequently with the Doctor during his exile to Earth.

John Levene (bio) made his first appearance as Benton in The Invasion (November 1968) and his last in The Android Invasion (December 1975).

Sergeant Benton

The Production Team

Peter Bryant's role in Doctor Who gradually decreased over the course of Season Six, and script editor Derrick Sherwin officially replaced him toward the end of the season, having already assumed many of Bryant's responsibilities. Meanwhile, Terrance Dicks (bio) was introduced into the team as the new script editor, a position he would occupy for longer than anyone else, before or after.

The Stories
The 
Dominators
The Dominators by Norman Ashby, directed by Morris Barry
On the peaceful planet Dulkis, war has been eradicated, but the Island of Death remains as a memorial to the Dulcians' violent past. Two alien Dominators land on the Island, and begin drilling into the planet's surface with the help of their diminutive but lethal robots, the Quarks. When the TARDIS arrives nearby, the Doctor, Jamie and Zoe befriend a rebellious young Dulcian named Cully, whose friends were murdered by the Quarks. But even with Cully's help, the time travellers find themselves unable to rouse the passive, sententious government of Dulkis to act against the Dominators -- and time is running out.
The Mind 
Robber
The Mind Robber by Peter Ling and Derrick Sherwin, directed by David Maloney
After an emergency dematerialisation, the TARDIS lands in a weird white void. Jamie and Zoe are tempted out of the time machine into a trap, while the Doctor fends off a psychic assault. In a desperate bid to escape, the Doctor tries to pilot the TARDIS somewhere else, only for the time machine to break apart. Suddenly, the three companions find themselves in a surreal world where imagination has become reality, populated by characters out of folklore and literature. They must navigate a series of riddles and deadly encounters to reach the mysterious Master of the realm. But what designs does he have for the Doctor?
The 
Invasion
The Invasion by Derrick Sherwin and Kit Pedler, directed by Douglas Camfield
After being attacked in space, the TARDIS materialises on Earth. There the Doctor is reunited with his old friend, Lethbridge-Stewart, who is now a brigadier in charge of the newly-formed United Nations Intelligence Taskforce: UNIT. The Doctor and Jamie are recruited to help UNIT's investigation of a company called International Electromatics, run by the sinister Tobias Vaughn, while Zoe meets Isobel Watkins, whose scientist father is missing. Vaughn is facilitating an invasion of the Earth, while forcing the captive Watkins to construct a device to double-cross his allies -- the Cybermen! (Episodes one and four are missing.)
The 
Krotons
The Krotons by Robert Holmes, directed by David Maloney
Every year in the city of the Gonds, the two brightest youths are taken into the bowels of a strange machine to join their people's gods, known as the Krotons. When the TARDIS lands nearby, however, the time travellers discover that the young people are somehow drained of their mental energies, then secretly ejected from the machine and killed. As this discovery sparks revolution and counter-revolution, Zoe succumbs to her inquisitiveness and activates a Gond learning machine. When she, too, is summoned to serve the Krotons, the Doctor has no choice but to confront the mysterious gods himself.
The Seeds Of 
Death
The Seeds Of Death by Brian Hayles, directed by Michael Ferguson
The Doctor, Jamie and Zoe arrive on Earth at a time when all transportation is conducted via T-Mat, a matter teleportation system operated from the Moon. The TARDIS materialises in a museum owned by Eldred, who resents T-Mat for rendering rocket technology obsolete. When the Ice Warriors invade the Moon, the humans manage to stall their plans by disabling T-Mat. The time travellers volunteer to journey to the control station aboard a rocket which Eldred has maintained. But it's just a matter of time before the Ice Warriors repair T-Mat, and use it to launch a global assault with deadly alien seed pods.
The Space 
Pirates
The Space Pirates by Robert Holmes, directed by Michael Hart
The TARDIS lands on a space beacon, which is in the process of being stolen by the cruel pirate Caven, who wants to harvest its valuable argonite. The Doctor, Jamie and Zoe are rescued by an aging pioneer named Milo Clancey. However, General Hermack of the Space Corps suspects Clancey of being the pirates' ringleader. Clancey flees to the planet Ta, home of the Issigri Mining Company, which is run by the daughter of his late business partner. But Ta is also the location of Caven's secret lair -- and the time travellers must uncover the connection between the pirates and Madeleine Issigri before it is too late. (Episodes one and three through six are missing.)
The War 
Games
The War Games by Malcolm Hulke and Terrance Dicks, directed by David Maloney
The Doctor, Jamie and Zoe believe the TARDIS has brought them back to Earth, in the midst of World War One. But it soon becomes apparent that they are nowhere of the sort. In fact, a race of aliens has been kidnapping soldiers from various points in the Earth's history and transporting them to another planet, with the intention of using them to form the greatest army the universe has ever seen. At the helm of this plot is the War Chief, a renegade Time Lord like the Doctor. To stop him, the Doctor may be forced to call upon his own people and give up his wandering in time and space forever.
The Time Lords return Jamie and Zoe to their own times, and force the Doctor to regenerate as punishment for his crimes of interference.

Making History

As the Sixties wound to a close, Season Six bade farewell to many elements which had previously characterised Doctor Who. Most obviously, an exhausted Patrick Troughton elected to draw his tenure as the Second Doctor to a close, and both Frazer Hines and Wendy Padbury decided to leave with him -- meaning that no regular castmembers would be continuing on to Season Seven. Eager to rein in budgets and aware of a growing sentiment that Doctor Who was growing stale, the production team piloted a new, Earthbound format involving the UNIT organisation, portending the new status quo of the following year. The veil of mystery surrounding the Doctor's past was drawn back, just a little, with The War Games introducing his people: the Time Lords. And these would be the programme's final monochrome episodes, as Doctor Who prepared to make the move to full colour. In more ways than one, it was the end of an era.