School teachers Ian and Barbara follow their student, Susan Foreman, back to her home which is just an old junk yard. There they meet an old man and suspect him of abducting Susan.

With 1963 London left behind, the teachers are amazed to find themselves on prehistoric Earth and are taken captive by a tribe of cavemen who are searching for the secret of fire.

The time travellers manage to escape the tribe but their path to the TARDIS through the forest holds dangers of its own. Meanwhile, Kal attempts to take advantage of events.

Kal has been banished from the tribe and Ian is making fire for Za in the hope that he will be grateful and will allow them to return to the TARDIS.

The travellers venture out on to the surface of a new world. Everything is dead but beyond a petrified jungle they see a huge metal city which the Doctor is determined to explore.

Looking for Barbara, the Doctor, Ian and Susan discover that they have exposed to lethal doses of radiation. The travellers are confronted by the city’s inhabitants – the Daleks!

Fearful of a Thal attack, the Daleks force Susan to trick the Thals. Realising that the Daleks are planning an ambush, the four travellers try to escape and warn the Thals.

Pretending to be a Dalek, Ian finds that that he is trapped inside the casing. The Doctor, Susan and Barbara have no choice but to abandon Ian as the real Daleks arrive and attack.

Ian and Barbara join a Thal expedition that will penetrate the Dalek city from the unguarded mountains behind it. Their journey is a dangerous one and not all will survive.

The Doctor and Susan are once again taken prisoner by the Daleks. In the mountains, Ian, Barbara and the Thals must negotiate a vast chasm to reach the city.

The Thals and the time travellers attack the Daleks from all sides as the Daleks start the countdown to release deadly doses of radiation into the atmosphere.

The TARDIS is suspended in space and the Doctor, Ian, Barbara and Susan are confused and frightened by a series of inexplicable events.

As the power of the TARDIS threatens to escape and destroy the ship, the travellers become increasingly paranoid and hostile towards each other.

The TARDIS lands on a remote island, surrounded by a sea of acid. They meet Arbitan, keeper of the Conscience of Marinus who forces the travellers to go in search of five keys.

In the city of Morphoton, the Doctor, Barbara, Ian and Susan are welcomed as honoured guests and given anything they want. But Barbara soon discovers that paradise is an illusion.

Ian and Barbara find a temple in the middle of a hostile jungle. Inside is the ailing Darrius, keeper of one of the keys. As Darrius dies he gives Ian a clue to find the key.

In a snowy wasteland, Vasor, an unscrupulous trapper, imprisons the travellers in a frozen cavern inside a mountain. There they find one of the keys frozen in a block of ice.

Arriving in the city of Millennius, Ian is put on trial for murder. The Doctor takes on the role of defence counsel and must prove Ian's innocence or he will be executed.

The Doctor solves the murder mystery and finds the final missing key. With Ian now free, the travellers return to the island only to discover that Arbitan has been murdered.

The TARDIS lands inside an Aztec temple in 15th Century Mexico and become cut off from the ship when they leave the temple to explore.

The High Priest of Sacrifice, Tlotoxl begins to doubt Barbara's claim to be the reincarnation of Yetaxa and plots to undermine her position and eliminate her friends.

The Doctor and Ian attempt to find a way back the TARDIS. Barbara attempts to distract Tlotoxl but the High Priest of Sacrifice already has plans for Susan.

Tlotoxl is preparing to make his move and have Barbara, the Doctor, Ian and Susan killed. Ian prepares for a fight to the death with the warrior, Ixta.

The TARDIS lands inside a spaceship orbiting the planet Sense-Sphere. The ship's crew are apparently dead but surprise the travellers when they abruptly return to life.

The Doctor and his companions are on board an Earth ship trapped in orbit around the Sense-Sphere when it is boarded by the Sensorites who steal the lock mechanism from the TARDIS.

The Sensorites take the Doctor, Susan, Ian and members of the spaceship crew down to the surface of the Sense-Sphere. There the Doctor learns about a previous Earth expedition...

On the Sense-Sphere, Ian has succumbed to the deadly illness that is spreading through the Sensorite city. Desperate to save his companion's life, the Doctor searches for a cure.

As Ian's condition worsens, the Doctor still searces for a cure to the mysterious illness. However, the Doctor's efforts are undermined by the Sensorite City Administrator.

Having found a cure to the illness, the Doctor discovers that it is in fact deadly nightshade poisoning which has been introduced into the city water supply.

An accident in flight leads to the TARDIS and the travellers being miniaturised. Now only an inch high, the Doctor, Barbara, Ian and Susan explore an English country garden.

The Doctor and his friends witness the giant Forrester murder Arnold Farrow. Ian and Barbara watch as one of the giants empties the sink in which the Doctor and Susan are hiding.

Barbara has been infected by the deadly insecticide but keeps her condition secret. Despite their small size, the travellers attempt to alert the authorities to Farrow’s murder.

The TARDIS lands in a ruined and empty London in the 22nd Century. Robomen patrol the shattered streets. The Doctor is eager to discover the cause of the city’s plight.

The Daleks have conquered the Earth. Susan and Barbara have joined the human resistance who launch an attack on the Dalek flying saucer where the Doctor and Ian are prisoners.

The rebel attack on the Dalek flying saucer has been defeated. London is crawling with Daleks and Robomen, and the Doctor, Barbara and Susan must escape the city.

The Doctor, Barbara and Susan make their way out of London to the Daleks’ mining operation in Bedfordshire whilst Ian faces the Black Dalek’s pet Slyther.

Barbara is put to work in the Dalek mine where it is revealed that the Daleks intend to use a bomb to extract the Earth’s magnetic core.

Ian attempts to derail the Daleks’ plan by sabotaging their bomb. The Doctor also works to undermine the Daleks by turning their Robomen slaves against them.

Arriving on the planet Dido, the Doctor, Barbara and Ian discover a crashed spaceship from Earth and survivors. They are terrorised by the monstrous Koquillion who attacks Barbara.

Ian and Barbara discover that the paralysed Bennett has gone missing from his cabin. The Doctor discovers the truth about Koquillion, but endangers his own life in doing so.

After relaxing at a Roman villa the Doctor is mistaken for a murdered lyre player and targeted by an assassin. Meanwhile, Ian and Barbara are captured by slave traders.

Barbara is sold as a slave and Ian is to be trained as a gladiator. The Doctor and Vicki arrive at the Emperor’s court with the Doctor still masquerading as Maximus Pettulian.

Poppaea plans to poison Barbara who has become the object of Nero’s affections. The Doctor is to be thrown to the lions, Ian and Delos are set against each other in the arena.

Inspired by the Doctor, Nero sets Rome ablaze. Ian must fight his way out of the arena and rescue Barbara. The Doctor and Vicki hurry to flee the city and escape to the TARDIS.

The TARDIS is pulled down to the barren world of Vortis. The Doctor and Ian explore. Barbara falls under an hypnotic influence and is compelled to leave the safety of the TARDIS.

Rescued by the Menoptra, Barbara is then captured by the ant-like Zarbi. The Doctor and Ian trace the missing TARDIS to a giant web city and encounter a mysterious intelligence.

The alien intelligence, the Animus, coerces the Doctor to track down the invading Menoptra. Ian escapes the Carsinome and joins forces with Vrestin, but the Zarbi are in pursuit.

Ian and Vrestin fall into caverns beneath the surface of Vortis and encounter the Optera. The Doctor finds the landing site of the Menoptra, and the Zarbi prepare to ambush them.

Barbara and a few of the Menoptra hide in an ancient temple. The Doctor and Vicki escape the Carsinome and join forces with Barbara’s group who are preparing to attack the Animus.

The Menoptra attack the Carsinome and the Doctor and his friends come face-to-face with the Animus. The Isop-Top device is their only hope of destroying the alien creature.

Exploring a museum on the planet Xeros, the travellers discover they are invisible. The Doctor deduces that the TARDIS has jumped a time track and they are seeing their own future.

Back on the proper time track, the travellers take steps to change the future. A rebel force of native Xerons are plotting against the invading Moroks who have captured the Doctor.

As events escalate, the travellers fear that they will not be able to escape their fate. Vicki helps orchestrate a raid on the Moroks’ armoury. Ian attempts to rescue the Doctor.

After forcing Lobos to revive the Doctor, Ian is also taken prisoner. The Xeron rebellion is underway whilst the fate of the Doctor and his friends still hangs in the balance.

Ian and Vicki are trapped by tentacled creatures on the planet Aridius. The Doctor and Barbara witness Daleks leaving Skaro on a mission to eliminate the Doctor and his companions.

The Doctor and his friends have been given shelter from the Daleks by the Aridians. But the Daleks threaten to kill the Aridians unless they hand over the time travellers.

The Daleks pursue the TARDIS through time and space. In an attempt to lose the Daleks, the Doctor makes a stop on the top of the Empire State Building and then on a sailing ship.

With the Daleks in pursuit, the TARDIS lands in what appears to be a haunted house. When the Daleks arrive, the travellers depart, not realising that they have left Vicki behind!

The Daleks follow the TARDIS to the jungle world of Mechanus, infested with lethal plants. There, the Daleks release a robot double of the Doctor that is programmed to kill.

The Doctor and his friends are taken prisoner by the Mechonoids. There they meet fellow prisoner, Steven Taylor. The Daleks break into the Mechonoid city and a battle commences.

The TARDIS lands on the English coast in 1066, but the travellers are puzzled to find modern day artifacts. A monk observes the arrival of the TARDIS, but seems unsurprised.

The Doctor is held prisoner by the Monk in the monastery whilst Vicki and Steven search for him. Meanwhile, a Viking war party arrives ahead of the main invasion fleet.

Steven and Vicki discover an atomic bazooka. It seems that the Monk has plans for the Viking invaders. Returning to the Monastery, Steven and Vicki make an amazing discovery.

Discovering the Monk’s plan, the Doctor is determined to stop him meddling with history. As the Viking fleet approaches, time is running out for both the Monk and the Doctor.

Arriving in the future on a spaceship carrying the remains of the Earth’s population, the Doctor, Steven and Dodo are accused of bringing the plague when Dodo’s cold turns deadly.

Put on trial and found guilty of introducing a deadly plague to the Ark, the lives of the Doctor, Steven and Dodo hang in the balance as the Doctor attempts to find a cure.

When the TARDIS returns to the Ark at the end of its centuries long voyage, the travellers discover that the humans have been enslaved by their former servants, the Monoids.

Unwilling to share the new world, Refusis with their human slaves, the Monoids plan to blow up the ark with a bomb which is hidden somewhere on the ship.

The Doctor, Steven and Dodo arrive in Tombstone in America’s Wild West. Mistaken for the infamous Doc Holliday, the Doctor unwittingly walks into a trap.

Tensions between the Clantons and Doc Holliday continue to grow and Steven finds himself caught in the crossfire.

Events in Tombstone take a turn for the worse when gunslinger Johnny Ringo is hired by the Clantons and shots are fired in the jailhouse.

Despite the Doctor’s efforts, a final showdown between the Clantons, Holliday, Earp and Ringo seems inevitable.

In London in 1966, the Doctor and Dodo visit the new Post Office Tower and are introduced to the super computer, WOTAN.

WOTAN has put in motion its plan to dominate the world and has ordered its human subjects to construct deadly war machines in secret locations.

With WOTAN's plans for world conquest about to reach fruition, the Doctor comes face-to-face with the unstoppable might of the War Machines.

The Doctor hatches a dangerous plan to capture a War Machine and turn WOTAN's creations against it.