The Doctor and his granddaughter Susan, aliens from another time, arrive on Earth. When two of Susan's school teachers discover the TARDIS and meet the Doctor, he kidnaps them, fearing they'll reveal their secret.
Unable to control where the TARDIS lands, their adventures include visiting alien planets, Skaro and Marinus, landing on alien spaceships and travelling back in time to the cavemen era and the French Revolution.
Episode 1 of 4 from An Unearthly Child
Two school teachers become concerned for one of their students, Susan. Following her home to an old junk yard.
Episode 2 of 4 from An Unearthly Child
With 1963 London left behind, the teachers are amazed to find themselves on prehistoric Earth.
Episode 3 of 4 from An Unearthly Child
The time travellers escape path to the TARDIS through the forest holds dangers of its own.
Episode 4 of 4 from An Unearthly Child
Kal has been banished from the tribe and Ian is making fire for Za in the hope that he will be grateful.
Episode 1 of 7 from The Daleks
Beyond a petrified jungle the time travellers see a huge metal city which the Doctor is determined to explore.
Episode 2 of 7 from The Daleks
Looking for Barbara, the Doctor, Ian and Susan discover that they have exposed to lethal doses of radiation.
Episode 3 of 7 from The Daleks
Realising that the Daleks are planning an ambush, the time travellers try to escape and warn the Thals.
Episode 4 of 7 from The Daleks
The Doctor, Susan, and Barbara must leave Ian behind as the real Daleks show up and start attacking.
Episode 5 of 7 from The Daleks
Ian and Barbara join a Thal expedition that will penetrate the Dalek city from the unguarded mountains behind it.
Episode 6 of 7 from The Daleks
In the mountains, Ian, Barbara and the Thals must negotiate a vast chasm to reach the city.
Episode 7 of 7 from The Daleks
The Daleks start the countdown to release deadly doses of radiation into the atmosphere.
Episode 1 of 2 from The Edge of Destruction
The TARDIS is suspended in space and the Doctor, Ian, Barbara and Susan are confused and frightened.
Episode 2 of 2 from The Edge of Destruction
The Doctor, Ian, Barbara and Susan become increasingly paranoid and hostile towards each other.
Episode 1 of 7 from Marco Polo
In the Himalayas and the Doctor, Barbara, Ian and Susan meet Marco Polo and join him on his journey.
Episode 2 of 7 from Marco Polo
In the dry Gobi desert, Tegana secretly slashes the water gourds, losing almost all of the precious water.
Episode 3 of 7 from Marco Polo
At the Cave of Five Hundred Eyes, Tegana has a secret meeting with a bandit who he instructs to kill Marco Polo.
Episode 4 of 7 from Marco Polo
In an effort to divert attention from himself, Tegana encourages Marco to be suspicious of the Doctor.
Episode 5 of 7 from Marco Polo
Ping Cho returns the TARDIS key to Susan so that the travellers might escape. But Tegana has other plans.
Episode 6 of 7 from Marco Polo
Ian follows Ping Cho to Cheng-Ting and there discovers that the TARDIS has been stolen by Tegana's allies.
Episode 7 of 7 from Marco Polo
Arriving at Kublai Khan's palace, the Doctor loses the TARDIS key to the Khan in a game of backgammon.
Episode 1 of 6 from The Keys of Marinus
The TARDIS lands on a remote island, surrounded by a sea of acid, where the Conscience of Marinus is kept.
Episode 2 of 6 from The Keys of Marinus
In the city of Morphoton, the travellers are welcomed as honoured guests and given anything they want.
Episode 3 of 6 from The Keys of Marinus
Ian and Barbara find a temple in the middle of a hostile jungle. Inside is Darrius, keeper of one of the keys.
Episode 4 of 6 from The Keys of Marinus
In a snowy wasteland, Vasor, an unscrupulous trapper, imprisons the travellers in a frozen cavern.
Episode 5 of 6 from The Keys of Marinus
Arriving in the city of Millennius, Ian is put on trial for murder. The Doctor takes on the role of defence counsel.
Episode 6 of 6 from The Keys of Marinus
With Ian now free, the travellers return to the island only to discover that Arbitan has been murdered.
Episode 1 of 4 from The Aztecs
The TARDIS lands inside an Aztec temple in 15th Century Mexico and become cut off from the ship.
Episode 2 of 4 from The Aztecs
Tlotoxl begins to doubt Barbara's claim to be the reincarnation of Yetaxa and plots to undermine her position.
Episode 3 of 4 from The Aztecs
Barbara attempts to distract Tlotoxl but the High Priest of Sacrifice already has plans for Susan.
Episode 4 of 4 from The Aztecs
Tlotoxl is preparing to make his move and have Barbara, the Doctor, Ian and Susan killed.
Episode 1 of 6 from The Sensorites
The TARDIS lands inside a spaceship orbiting the planet Sense-Sphere. The crew on board appear dead.
Episode 2 of 6 from The Sensorites
The spaceship is boarded by the Sensorites who steal the lock mechanism from the TARDIS.
Episode 3 of 6 from The Sensorites
The Sensorites take the Doctor, Susan, Ian and the spaceship crew down to the surface of the Sense-Sphere.
Episode 4 of 6 from The Sensorites
On the Sense-Sphere, Ian has succumbed to the deadly illness that is spreading through the Sensorite city
Episode 5 of 6 from The Sensorites
The Doctor still searches for a cure for the mysterious illness but is undermined by the Sensorite Administrator.
Episode 6 of 6 from The Sensorites
The Doctor discovers that the illness is a deadly poisoning that has been introduced into the city water supply.
Episode 1 of 6 from The Reign of Terror
The TARDIS mistakenly materialises in 18th Century France during the French Revolution.
Episode 2 of 6 from The Reign of Terror
In Paris, Ian, Barbara and Susan are sentenced to death under the blade of the guillotine.
Episode 3 of 6 from The Reign of Terror
Barbara and Susan are saved from death by.the guillotine by two French royalists, Jules and Jean.
Episode 4 of 6 from The Reign of Terror
Leon, a supporter of the monarchy, orchestrates a plan for Barbara to convey Susan to a medical practitioner.
Episode 5 of 6 from The Reign of Terror
The Doctor arranges for Barbara's escape when they reunite at the prison, while Susan stays imprisoned.
Episode 6 of 6 from The Reign of Terror
The Doctor guides Lemaitre to the royalist house where he discloses his true identity.