London, 1963. Schoolteachers Ian Chesterton and Barbara Wright are perplexed by the behaviour of one of their pupils, Susan Foreman. Her knowledge of science and history exceeds theirs, yet she seems totally ignorant of many common aspects of everyday life. They follow her to her home address, a junkyard with a police telephone box standing in it, and encounter her grandfather, the enigmatic Doctor. When they force their way past him into the police box, Susan's secret is revealed: she and the Doctor are aliens, and the police box is a time machine, the TARDIS, capable of visiting any point in the universe at any moment in time...

Earth, 100,000 B.C. The enigmatic Doctor, afraid that schoolteachers Ian Chesterton and Barbara Wright will reveal his secrets to the people of 20th century Earth, has taken them and his granddaughter Susan back to the dawn of human history. There, the four travellers are dragged into the savage politics of a tribe of cavemen who have lost the secret of making fire...

Prisoners of the earliest humans, the TARDIS crew are caught in a deadly power play for leadership of the tribe.

The TARDIS crew must make fire for the early humans to stay alive. But once they do, they may not be allowed to leave!

Time Unknown, Planet Unknown. The TARDIS lands in an eerie petrified forest overlooking a magnificent steel city. The Doctor wants to explore the city - but what is waiting there?

The dead planet is not uninhabited after all. The Doctor is about to meet what will become his greatest enemies. And he and his crew are dying of radiation sickness.

Imprisoned on Skaro by the scheming Daleks, the Doctor and his companions work to escape their clutches.

The time travellers work desperately to both escape the Dalek city and prevent a bloody massacre.

The time travellers have escaped from the Daleks, but left a vital piece of the TARDIS behind. Getting it back will mean pushing the Thals to mount a dangerous operation.

Ian, Barbara and the Thals struggle through the caves to reach the Dalek city. Will they get there in time? Is there even a way through the treacherous caves? And what are the Daleks planning?

Time is running out as the Doctor and his companions try to defeat the Daleks before they wipe out all life on Skaro.

A mysterious explosion has knocked the TARDIS into void. And in their confusion, the crew are turning on one another.

The TARDIS is adrift, the crew turning on each other. Only by working together can they find their way out before they are destroyed.

The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive - but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled - not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...

The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive - but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled - not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...

The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive - but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled - not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...

The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive - but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled - not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...

The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive - but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled - not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...

The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive - but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled - not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...

The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive - but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled - not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...

The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

Mexico, the early 15th century.The TARDIS arrives in the tomb of former Aztec High Priest Yetaxa. The travellers become cut off from the ship when they go and explore the temple outside. Barbara is acclaimed by the High Priest of Knowledge, Autloc, as Yetaxa's divine reincarnation. However, she incurs the wrath of the High Priest of Sacrifice, Tlotoxl, when she attempts to use her new-found authority to stop the Aztec practice of human sacrifice. Can Barbara change the course of history and save the Aztecs? Can the time travellers find a way back into the tomb? Or will they fall victim to Tlotoxl's altar of sacrifice?

Mexico, the early 15th century.The TARDIS arrives in the tomb of former Aztec High Priest Yetaxa. The travellers become cut off from the ship when they go and explore the temple outside. Barbara is acclaimed by the High Priest of Knowledge, Autloc, as Yetaxa's divine reincarnation. However, she incurs the wrath of the High Priest of Sacrifice, Tlotoxl, when she attempts to use her new-found authority to stop the Aztec practice of human sacrifice. Can Barbara change the course of history and save the Aztecs? Can the time travellers find a way back into the tomb? Or will they fall victim to Tlotoxl's altar of sacrifice?

Mexico, the early 15th century.The TARDIS arrives in the tomb of former Aztec High Priest Yetaxa. The travellers become cut off from the ship when they go and explore the temple outside. Barbara is acclaimed by the High Priest of Knowledge, Autloc, as Yetaxa's divine reincarnation. However, she incurs the wrath of the High Priest of Sacrifice, Tlotoxl, when she attempts to use her new-found authority to stop the Aztec practice of human sacrifice. Can Barbara change the course of history and save the Aztecs? Can the time travellers find a way back into the tomb? Or will they fall victim to Tlotoxl's altar of sacrifice?

Mexico, the early 15th century.The TARDIS arrives in the tomb of former Aztec High Priest Yetaxa. The travellers become cut off from the ship when they go and explore the temple outside. Barbara is acclaimed by the High Priest of Knowledge, Autloc, as Yetaxa's divine reincarnation. However, she incurs the wrath of the High Priest of Sacrifice, Tlotoxl, when she attempts to use her new-found authority to stop the Aztec practice of human sacrifice. Can Barbara change the course of history and save the Aztecs? Can the time travellers find a way back into the tomb? Or will they fall victim to Tlotoxl's altar of sacrifice?

The 28th century. The TARDIS materialises on a spaceship orbiting a planet known as the Sense-Sphere, whose natives, the Sensorites, have trapped the ship's human crew in a state of paralysis.

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 Doctor and his companions are escorted to the Sense-Sphere where they attempt to negotiate with the Sensorites for the release of the TARDIS.

Trapped on the Sense-Sphere, Ian is dying from the illness that has been hugging the Sensorites and the Doctor tries to find a cure.

Trapped on the Sense-Sphere, the Doctor's investigations into the cause of the sickness affecting the Sensorites are hampered by the subversive activities of the City Administrator.

Trapped on the Sense-Sphere, the Doctor and his companions find three deranged human survivors who have been fighting a guerilla war against the Sensorites.

The Doctor's friends are captured by soldiers in post-Revolutionary France, during the reign of terror in which anyone suspected of Royalist sympathies is immediately executed. Ian is thrown into jail with a dying English prisoner, who gives him a vital message for English master spy James Stirling. Robespierre's right-hand man, Citizen Lemaitre, secretly helps Ian to escape. The Doctor arrives, disguised as a prominent Citizen to arrange for his friends' release, but Lemaitre sees through his guise and threatens to have Susan executed unless the Doctor leads him to the escape route run by Jules Renan. There, Lemaitre reveals himself to be Stirling, and enlists Ian and Barbara's help to complete his mission. So doing, they see Paul Barrass inviting Napoleon Bonaparte to rule the country as part of a triumverate after Robespierre is overthrown. Stirling tries to stop this for the sake of his own country, but he is too late to prevent the mob from turning on Robespierre. Nevertheless he is true to his word and releases Susan, allowing the travellers to escape from Paris.

The Doctor's friends are captured by soldiers in post-Revolutionary France, during the reign of terror in which anyone suspected of Royalist sympathies is immediately executed. Ian is thrown into jail with a dying English prisoner, who gives him a vital message for English master spy James Stirling. Robespierre's right-hand man, Citizen Lemaitre, secretly helps Ian to escape. The Doctor arrives, disguised as a prominent Citizen to arrange for his friends' release, but Lemaitre sees through his guise and threatens to have Susan executed unless the Doctor leads him to the escape route run by Jules Renan. There, Lemaitre reveals himself to be Stirling, and enlists Ian and Barbara's help to complete his mission. So doing, they see Paul Barrass inviting Napoleon Bonaparte to rule the country as part of a triumverate after Robespierre is overthrown. Stirling tries to stop this for the sake of his own country, but he is too late to prevent the mob from turning on Robespierre. Nevertheless he is true to his word and releases Susan, allowing the travellers to escape from Paris.

The Doctor's friends are captured by soldiers in post-Revolutionary France, during the reign of terror in which anyone suspected of Royalist sympathies is immediately executed. Ian is thrown into jail with a dying English prisoner, who gives him a vital message for English master spy James Stirling. Robespierre's right-hand man, Citizen Lemaitre, secretly helps Ian to escape. The Doctor arrives, disguised as a prominent Citizen to arrange for his friends' release, but Lemaitre sees through his guise and threatens to have Susan executed unless the Doctor leads him to the escape route run by Jules Renan. There, Lemaitre reveals himself to be Stirling, and enlists Ian and Barbara's help to complete his mission. So doing, they see Paul Barrass inviting Napoleon Bonaparte to rule the country as part of a triumverate after Robespierre is overthrown. Stirling tries to stop this for the sake of his own country, but he is too late to prevent the mob from turning on Robespierre. Nevertheless he is true to his word and releases Susan, allowing the travellers to escape from Paris.

The Doctor's friends are captured by soldiers in post-Revolutionary France, during the reign of terror in which anyone suspected of Royalist sympathies is immediately executed. Ian is thrown into jail with a dying English prisoner, who gives him a vital message for English master spy James Stirling. Robespierre's right-hand man, Citizen Lemaitre, secretly helps Ian to escape. The Doctor arrives, disguised as a prominent Citizen to arrange for his friends' release, but Lemaitre sees through his guise and threatens to have Susan executed unless the Doctor leads him to the escape route run by Jules Renan. There, Lemaitre reveals himself to be Stirling, and enlists Ian and Barbara's help to complete his mission. So doing, they see Paul Barrass inviting Napoleon Bonaparte to rule the country as part of a triumverate after Robespierre is overthrown. Stirling tries to stop this for the sake of his own country, but he is too late to prevent the mob from turning on Robespierre. Nevertheless he is true to his word and releases Susan, allowing the travellers to escape from Paris.

The Doctor's friends are captured by soldiers in post-Revolutionary France, during the reign of terror in which anyone suspected of Royalist sympathies is immediately executed. Ian is thrown into jail with a dying English prisoner, who gives him a vital message for English master spy James Stirling. Robespierre's right-hand man, Citizen Lemaitre, secretly helps Ian to escape. The Doctor arrives, disguised as a prominent Citizen to arrange for his friends' release, but Lemaitre sees through his guise and threatens to have Susan executed unless the Doctor leads him to the escape route run by Jules Renan. There, Lemaitre reveals himself to be Stirling, and enlists Ian and Barbara's help to complete his mission. So doing, they see Paul Barrass inviting Napoleon Bonaparte to rule the country as part of a triumverate after Robespierre is overthrown. Stirling tries to stop this for the sake of his own country, but he is too late to prevent the mob from turning on Robespierre. Nevertheless he is true to his word and releases Susan, allowing the travellers to escape from Paris.

The Doctor's friends are captured by soldiers in post-Revolutionary France, during the reign of terror in which anyone suspected of Royalist sympathies is immediately executed. Ian is thrown into jail with a dying English prisoner, who gives him a vital message for English master spy James Stirling. Robespierre's right-hand man, Citizen Lemaitre, secretly helps Ian to escape. The Doctor arrives, disguised as a prominent Citizen to arrange for his friends' release, but Lemaitre sees through his guise and threatens to have Susan executed unless the Doctor leads him to the escape route run by Jules Renan. There, Lemaitre reveals himself to be Stirling, and enlists Ian and Barbara's help to complete his mission. So doing, they see Paul Barrass inviting Napoleon Bonaparte to rule the country as part of a triumverate after Robespierre is overthrown. Stirling tries to stop this for the sake of his own country, but he is too late to prevent the mob from turning on Robespierre. Nevertheless he is true to his word and releases Susan, allowing the travellers to escape from Paris.