Classic Doctor Who

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21. The Keys of Marinus: The Sea of Death - 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.

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Series 1

1. An Unearthly Child

Two concerned schoolteachers follow a pupil home to meet her Grandfather, the Doctor.

2. An Unearthly Child: The Cave of Skulls

To the teacher's disbelief, the TARDIS transports them all back to the Stone Age.

3. An Unearthly Child: The Forest of Fear

The Doctor and crew leave the TARDIS to explore their new surroundings, but danger awaits.

4. An Unearthly Child: The Firemaker

In the hope of gaining freedom, the Doctor shows Za how to make fire.

5. The Daleks: The Dead Planet

The TARDIS lands on Skaro where the travellers meet the peaceful, non-agressive Thals.

6. The Daleks: The Survivors

Looking for Barbara, the travellers discover that they are exposed to radiation poisoning.

7. The Daleks: The Escape

Susan delivers a message of peace to the Daleks from their old enemies the Thals.

8. The Daleks: The Ambush

Pretending to be a Dalek, Ian soon realises that he's trapped inside the casing.

9. The Daleks: The Expedition

It is time for the Thals to strike back against the Daleks with the help of the Doctor.

10. The Daleks: The Ordeal

The Doctor's attack group soon attracts the attention of the Daleks.

11. The Daleks: The Rescue

Can the Thals overcome their pacifist beliefs in order to destroy the Daleks?

12. The Edge of Destruction

The Doctor and his crew begin to act strangely after a mysterious explosion on the TARDIS.

13. The Edge of Destruction: The Brink of Disaster

The time travellers are in grave danger as the TARDIS nears total disintegration.

21. The Keys of Marinus: The Sea of Death

The TARDIS lands on a remote island, surrounded by a sea of acid and are set a task.

22. The Keys of Marinus: The Velvet Web

In the city of Morphoton, the Doctor, Barbara, Ian and Susan are welcomed as guests.

23. The Keys of Marinus: The Screaming Jungle

Ian and Barbara find a temple in the jungle. Inside is Darrius, keeper of one of the keys.

24. The Keys of Marinus: The Snows of Terror

In a snowy wasteland, Vasor, an unscrupulous trapper, imprisons the travellers.

25. The Keys of Marinus: Sentence of Death

Arriving in Millennius, Ian is put on trial for murder. The Doctor takes his case.

26. The Keys of Marinus

The Doctor solves the murder mystery and finds the final missing key.

27. The Aztecs: The Temple of Evil

When Barbara meets the Aztecs they mistake her for a reincarnation of the High Priest.

28. The Aztecs: The Warriors of Death

Barbara's interference in Aztec traditions cast doubt over her supposed divinity.

29. The Aztecs: The Bride Of Sacrifice

Barbara's divine powers are challenged and she humiliates Tlotoxl.

30. The Aztecs: The Day of Darkness

Can the Doctor and his companions escape before they are sacrificed to the Sun God?

31. The Sensorites: Strangers in Space

The crew onboard a spaceship have been trapped in a state of permanent paralysis.

32. The Sensorites: The Unwilling Warriors

Communicating through Susan using telepathic powers, the Sensorites contact the Doctor.

33. The Sensorites: Hidden Danger

The Doctor and his companions uncover a shattering truth on the Sense-Sphere.

34. The Sensorites: A Race Against Death

Convinced that Ian has actually been poisoned, the Doctor decides to investigate.

35. The Sensorites: Kidnap

Carol puts herself in danger when she attempts to find the Doctor at the aqueduct.

36. The Sensorites: A Desperate Venture

The Doctor and Ian discover the identity of the strange creatures that poisoned the water.