44 episodes were originally broadcast in 1967
The Doctor, Ben and Polly are taken safely back to the TARDIS, where they invite Jamie to join them.
Taken into the depths of the Earth, where they find a hidden civilisation - the lost city of Atlantis
As the Doctor talks to Zaroff, Jamie and Ben are sent to the mines but try to escape.
The Fish People to revolt against their masters and put a stop to the production of food.
As Zaroff's insane scheme to destroy the world nears completion, the Doctor plans to break down the sea wall.
The TARDIS lands on the Moon in 2070 at the weather control moonbase where a plague has struck.
Polly discovers that the Cyberman are abducting the plague victims, but nobody believes her until it is too late.
The Cybermen have taken control of the moonbase and are preparing to use the weather control systems.
The moonbase is cut off from Earth and under siege. The Cybermen launch an all-out attack.
The Doctor discovers an ideal community, but there is a rebel in their midst.
Ben has been brainwashed, Polly tries to escape from Ben but runs straight into the claws of the Macra.
The Doctor, Polly and Jamie are sent to the salt mines and discover their frightening secret.
The Doctor finally comes face to face with the Controller and makes a discovery.
The TARDIS arrives at Gatwick airport in 1966 where Polly witnesses a murder
All clues point to Chameleon Tours, but nobody believes the Doctor's story
With the support of Inspector Crossland, the Doctor pursues his investigations
An RAF fighter follows the Chameleon plane but it is shot down whilst the plane heads into space
The Doctor smuggles himself aboard the next Chameleon Tours flight
The Doctor faces the Chameleon's Director who announces his plans to abduct 50,000 humans
The TARDIS has been stolen, clues lead to a mysterious antique shop.
The Doctor and Jamie have been transported back in time one hundred years.
The Doctor has been forced by the Daleks to subject his companion, Jamie to a series of tests.
Using Jamie as a test, the Doctor demonstrates the strength of the human factor to the Daleks.
Victoria is still a captive of the Daleks and Jamie suspects that the Doctor has surrendered to the Daleks.
The Doctor and Jamie are taken by the Daleks to Skaro where the Dalek Emperor confronts them.
The human factor is spreading through the Dalek city and Dalek fights Dalek in a civil war.
The Doctor meet Professor Parry and his archaeologists on the planet Telos.
Professor Parry and his team begin to unlock the secrets of the Cybermen's tomb.
The Cybermen have risen from their hibernation and are intent on converting the humans.
The Cyber Controller has been revitalised after leaving the icy tomb, threatening to overpower his human foes.
The Doctor is accused of murder by Professor Travers who is in search of the legendary Yeti.
Jamie and Victoria make an incredible discovery in a cave on the mountain.
When a Yeti is captured by the Detsen monks, the Doctor discovers that it is a robot!
The old High Lama is in the control of the alien Great Intelligence which plans to invade Earth.
Discovering that his old friend is still alive after three hundred years, the Doctor goes to confront him.
As the Great Intelligence manifests itself on Earth, the Doctor makes an attempt to repel the evil entity.
The TARDIS arrives on Earth in the midst of a new ice age where a huge Ice Warrior is found frozen in the ice.
Varga, the Ice Warrior, has returned to life and has captured Victoria and takes her with him to the glacier.
Varga revives four fellow Ice Warriors from the ice and they begin to excavate their ship.
The Doctor goes to the Ice Warriors' ship in an attempt to broker a peace, but they do not trust him.
The Ice Warriors are preparing to fire their deadly sonic cannon at the Brittanicus Base.
The Ice Warriors invade the human's base, and it is up to the Doctor to repel them.
Arriving on an Australian beach in the future, the Doctor is mistaken for political leader Salamander.
Jamie and Victoria travel to Europe where they infiltrate Salamander's staff.