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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 played the Doctor from The Power Of The Daleks in November 1966 to The War Games in June 1969. He also returned to the role for The Three Doctors (December 1972), The Five Doctors (November 1983), and The Two Doctors (February 1985). Troughton passed away in 1987.

Companions and Recurring Characters

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

Frazer Hines played Jamie from The Highlanders in December 1966 to The War Games in June 1969. He subsequently returned to the role for The Five Doctors in November 1983 and The Two Doctors in February 1985.

Jamie 
McCrimmon

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

Deborah Watling played Victoria from The Evil Of The Daleks in May 1967 to The Wheel In Space in April 1968. She returned for Dimensions In Time in 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 was introduced into the production team to take over from them. He served as both script editor and producer on various stories toward the end of Season Four. Davis finally departed as script editor at the season's end, but Lloyd would remain for some time yet while Bryant became more firmly installed as Doctor Who's new producer.

The Stories
The Power Of 
The Daleks
The Power Of The Daleks by David Whitaker and Dennis Spooner, directed by Christopher Barry
Still suspicious of the younger man claiming to be the Doctor, Ben and Polly discover that the TARDIS has landed on the Earth colony Vulcan. There, a scientist named Lesterson has unearthed a crashed capsule containing the inert forms of three Daleks. The Doctor is horrified to learn that Lesterson has reactivated them, intending for them to serve the colony's populace. But the time travellers soon discover that the Daleks have a far more malevolent 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 Bonnie Prince Charlie. There, the Doctor, Polly and Ben meet the McLarens and their piper, Jamie McCrimmon, who are being hunted by the English. The time travellers soon discover that a crooked solicitor named Grey is attempting to sell the Highlanders as slaves in the West Indies... and they are to be amongst the first shipment. (All four episodes are missing.)
Jamie sneaks on board the TARDIS and joins the Doctor.
The 
Underwater Menace
The Underwater Menace by Geoffrey Orme, directed by Julia Smith
When the TARDIS lands on a volcanic island in the middle of the Pacific, the Doctor, Polly, Ben and Jamie soon find a passageway down to the lost city of Atlantis. There, the Doctor meets the famous scientist Professor Zaroff, who has concocted a mad plan to raise Atlantis by draining the ocean waters down into the Earth's core, destroying the planet. It is up to Ben and Jamie to raise a revolution amongst the Atlantean Fish People... before Polly is transformed into one herself. (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 a moonbase in the year 2070. Housed there is the Gravitron, a device which controls the Earth's weather. But a suspicious plague has erupted among the base's crew, and the Gravitron has been experiencing mysterious faults. The moonbase chief suspects the time travellers are responsible, but the Doctor soon realises that his old foes, the Cybermen, are covertly at work in 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 feek of a holiday camp. But the Doctor, Polly, Ben and Jamie quickly become aware that a sinister force is lurking beneath the jolly veneer of the settlement, in the form of the mammoth crab-like Macra who have secretly infiltrated the colony administration and are using the settlers for slave labour. And already, Ben has fallen into the Macra's power. (All four episodes are missing.)
The 
Faceless Ones
The Faceless Ones by David Ellis and Malcolm Hulke, directed by Gerry Mill
Arriving back in 1966 London at Gatwick Airport, the Doctor, Polly, Ben and Jamie soon learn of mysterious disappearances which have occurred with alarming frequency at the airport. To make matters worse, Ben and Polly also vanish, and a perfect duplicate of Polly appears claiming never to have met the Doctor or Jamie. The Doctor soon learns of the true force at work: the Chameleons, faceless aliens who are attempting to steal the identities of the kidnapped commuters and take over the Earth. (Episodes two and four through six are missing.)
Having arrived back on present-day Earth, Ben and Polly decide to leave the Doctor.
The Evil Of 
The Daleks
The Evil Of The Daleks by David Whitaker, directed by Derek Martinus
The TARDIS is stolen from Gatwick Airport, and the Doctor and Jamie pursue it through a time corridor back to 1866. There, they are captured by the Daleks, who are ostensibly trying to isolate the Human Factor, that which makes mankind truly human. But with the help of scientist Edward Waterfield, whose daughter Victoria is held hostage by the Daleks, the Doctor discovers his old enemies are actually searching for the Dalek Factor... which they intend to imprint upon every human in history. (Episodes one and three through seven are missing.)
Orphaned after her father is murdered by the Daleks, Victoria leaves with the Doctor and Jamie.

Making History
The regeneration gamble proved a success, and Doctor Who's survival was assured for the time being. Furthermore, Gerry Davis and Kit Pedler had devised a monster whose popularity was to be exceeded only by the Daleks, in the form of the Cybermen. Lloyd and Davis completed their redefinition of Doctor Who by doing away with the concept of the historical story. In the future, almost every story would feature some science-fiction content, as the series moved further and further away from the educational concept originally formulated by Sydney Newman and toward the more mainstream elements of the genre which held such popular appeal.

Season Five (1967-68): Monstrous Encounters

Companions and Recurring Characters

Zoe Heriot was a brilliant astrophysicist from the 21st century who met the Doctor during a Cyberman invasion of the space station on which she worked.

Wendy Padbury played Zoe from The Wheel In Space in April 1968 to The War Games in June 1969. She also returned for The Five Doctors in 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 played Lethbridge-Stewart in The Web Of Fear (February 1968) and The Invasion (November 1968), regularly from Spearhead from Space (January 1970) to Terror Of The Zygons (September 1975), and then again in Mawdryn Undead (February 1983), The Five Doctors (November 1983), Battlefield (September 1989), and finally Dimensions In Time (November 1993). He also appeared in The Sarah Jane Adventures, in Enemy Of The Bane. Courtney died in February 2011.

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. Bryant had been acting as script editor for much of the season, although Victor Pemberton had filled in early on. With Bryant now the show's permanent producer, Derrick Sherwin arrived to take over the script editor post for the latter portion of Season Five.

The Stories
The Tomb Of 
The Cybermen
The Tomb Of The Cybermen by Kit Pedler and Gerry Davis, directed by Morris Barry
The Doctor, Jamie and Victoria land on the desert planet Telos, where an archaeological expedition from Earth has also arrived. The scientists are searching for the fabled tombs to which the dying Cybermen removed themselves many years earlier. The Doctor is adamant that his old enemies be left in hibernation, but two members of the research team, the Logicians Klieg and Kaftan, have plans to use the Cybermen to help them dominate the galaxy.
The 
Abominable Snowmen
The Abominable Snowmen by Mervyn Haisman and Henry Lincoln, directed by Gerald Blake
The Doctor is delighted when the TARDIS lands near a monastery in Tibet because it means he can return the monks' sacred ghanta which he took with him for safekeeping centuries earlier. But all is not well at the monastery: there is disharmony amongst the monks, and the countryside is overrun by robotic Yeti. Soon, the Doctor finds himself accused of murder, whilst an extradimensional force called the Great Intelligence prepares to return to Earth... using one of the Doctor's friends as a vessel. (Episodes one and three through six are missing.)
The Ice 
Warriors
The Ice Warriors by Brian Hayles, directed by Derek Martinus
In the year 3000, the Earth is on the brink of a new Ice Age, as the countries of the world are buried beneath mammoth glaciers. The Doctor, Jamie and Victoria arrive in England as a small team of scientists desperately tries to hold back the ice. But a new threat comes when an ancient spaceship is discovered frozen in the glacier. Soon its crew, the warlike Ice Warriors from Mars, reawaken and become intent on delivering themselves from the planet, at any 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. A series of catastrophic earthquakes have shaken the planet, resulting in political upheaval. At the same time, the famous scientist Salamander unveils his Suncatcher satellites, which he claims will feed the starving corners of the world. But the Doctor soon discovers a link between the satellites and the earthquakes, uncovering a plot by Salamander -- the Doctor's doppelganger -- to take over the world.
The Web Of 
Fear
The Web Of Fear by Mervyn Haisman and Henry Lincoln, directed by Douglas Camfield
The TARDIS materialises in modern-day London, where the Doctor, Jamie and Victoria discover the city deserted and covered in a weird web-like substance. Meeting up with the military and Colonel Lethbridge-Stewart in the London Underground, they learn that the Great Intelligence and its Yeti are active once again. And this time, the Intelligence's main goal is none other than the possession of the mind of the Doctor. (Episode three is missing.)
Fury From The 
Deep
Fury From The Deep by Victor Pemberton, directed by Hugh David
On the North Sea coast in the modern day, the Doctor, Jamie and Victoria learn of a series of mishaps and strange occurrences which has been plaguing the oil refineries. They soon find that a form of intelligent seaweed is rising up from the seabed, attempting to take over humanity -- and the invasion has already begun. (All six episodes are missing.)
Victoria decides to stay behind to be adopted by the Harrises, who helped the time travellers defeat the Weed.
The Wheel In 
Space
The Wheel In Space by David Whitaker and Kit Pedler, directed by Tristan de Vere Cole
The Doctor and Jamie find themselves on a space wheel in the 21st century. Mysterious things have been happening on board the wheel: equipment has been sabotaged, crewmembers have gone missing, and the director, Bennett, is on the verge of a nervous breakdown. The Doctor discovers that the Cybermen, once again intent on invading the Earth, are about to board the wheel, taking control of the entire crew. (Episodes one, two, four and five are missing.)
The space wheel's astrophysicist, Zoe Heriot, sneaks on board the TARDIS to join the Doctor and Jamie.

Making History
Season Five has become renowned in Doctor Who history as the Year of the Monsters. As the new format devised by Innes Lloyd and Gerry Davis truly came centre-stage, 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 famous 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 played Benton in The Invasion in November 1968, and then regularly from The Ambassadors of Death in March 1970 to The Android Invasion in 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 was introduced into the team as the new script editor, a position he would occupy for longer than anyone else, before or after, and marking the start of an association with Doctor Who that continues to this day.

The Stories
The 
Dominators
The Dominators by Norman Ashby, directed by Morris Barry
The Doctor, Jamie and Zoe find themselves on peaceful Dulkis, a planet where war has been eradicated. But landing at the same time are the warlike Dominators and their diminutive robots, the Quarks. The Dominators plan to detonate a bomb in Dulkis' core, thereby turning the planet into a radioactive ball with which they can fuel their space fleet.
The Mind 
Robber
The Mind Robber by Peter Ling and Derrick Sherwin, directed by David Mahoney
After an emergency dematerialisation, the TARDIS lands in a weird white void. Drawn out of the time machine, the Doctor, Jamie and Zoe find themselves in a surreal world where imagination has become reality, populated with characters out of folklore and literature. And the mysterious overlord of this Land of Fiction desires the Doctor's company... forever.
The 
Invasion
The Invasion by Derrick Sherwin and Kit Pedler, directed by Douglas Camfield
With the help of the newly-formed United Nations Intelligence Taskforce (UNIT), led by their old friend Lethbridge-Stewart -- newly promoted to Brigadier -- the Doctor, Jamie and Zoe discover that businessman Tobias Vaughn has been conspiring with the Cybermen. Partially cybernised himself, Vaughn plans to give the Earth over to the Cybermen unless the Doctor can stop him... but the Cybermen have already arrived. (Episodes one and four are missing.)
The 
Krotons
The Krotons by Robert Holmes, directed by David Maloney
The TARDIS lands on a planet where, every year, the two brightest Gond youths disappear into the bowels of a machine to join their people's gods. But the Doctor, Jamie and Zoe discover that the “gods” are really crystalline aliens called the Krotons, who are feeding on the mental energies of the children. And the Doctor and Zoe are next on the menu.
The Seeds Of 
Death
The Seeds Of Death by Brian Hayles, directed by Michael Ferguson
It is the 21st century, and all transportation on Earth is provided by T-Mat, a matter teleportation system operated from the moon. But as the Doctor, Jamie and Zoe arrive, the T-Mat station is taken over by the Ice Warriors. The Martians plan to turn the Earth into a new Mars by spreading special seeds over the planet which will alter the Earth's climate, and T-Mat is to be the method by which their horrible plan will be accomplished.
The Space 
Pirates
The Space Pirates by Robert Holmes, directed by Michael Hart
When the space beacon on which the TARDIS has materialised is stolen by the cruel pirate Caven, the Doctor, Jamie and Zoe team up with an aging pioneer named Milo Clancy to recover their ship. Along the way, they must survive attempts by Caven to destroy them, avoid the Earth officials who have mistaken them for the thieves, and discover the truth behind the Issigri Mining Company's operations on the planet Ta. (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 into his third incarnation as punishment.

Making History

Few seasons before or since have been simultaneously as tumultuous and as important as Season Six. With viewing figures on the decline and the sentiment rampant that Doctor Who was past its prime, it was clear that, once again, the series needed to be revamped. To this end, the UNIT concept was created, to give Doctor Who a recurring Earth-based cast and hence enable the production crew an excuse to cut back on the more expensive outer space adventures.

Furthermore, the decision was taken to finally reveal more about the Doctor's past. In The War Games, a visit was paid to the Doctor's (then unnamed) home planet and the truth about his nature as a Time Lord and his flight from that culture was unveiled.

Meanwhile, Patrick Troughton, wary of typecasting, had elected to leave Doctor Who, as had Frazer Hines, who had now logged more episodes than any other companion. Wendy Padbury consequently decided that this was also a good time for her to bow out of the programme. The slate was therefore wiped clean for an all-new Doctor Who the following year...