UNIT investigates when scientists go missing kidnapped by an alien trapped in the 13th Century. Travelling back in time in the TARDIS, the Doctor is unaware that he has stowaway.
- Drama
- Year 1973
- 24 min
Beloved companion Sarah Jane Smith, played by Elisabeth Sladen, makes her first appearance and so do the Sontarans in the form of Linx, trapped on medieval Earth and abducting scientists from the future to aid his escape.
- Year: 1973
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E5 • Invasion of the Dinosaurs: Part 1
The Doctor and Sarah return in the TARDIS to present day London but are mystified when they find the city completely deserted.
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E6 • Invasion of the Dinosaurs: Part 2
The Doctor plans to capture a dinosaur so that he can discover who is transporting them through time. But Mike Yates is in league with the enemy and is ordered to stop the Doctor.
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E7 • Invasion of the Dinosaurs: Part 3
The Doctor has captured a Tyrannosaurus Rex but the conspirators don’t intend for it to remain captive for long. Sarah follows a lead but places herself in the hands of the enemy.
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E8 • Invasion of the Dinosaurs: Part 4
Sarah awakens to discover that she is on a spaceship that left Earth months ago and is heading for a new world. The Doctor is framed for causing the return of the dinosaurs.
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E9 • Invasion of the Dinosaurs: Part 5
Sarah discovers that the spaceship passengers are all victims of a deception, but not all are willing to believe her story.
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E10 • Invasion of the Dinosaurs: Part 6
Dinosaurs are appearing all over London in a last effort to frighten people away as Professor Whitaker prepares to initiated ‘Operation Golden Age’.
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E11 • Death to the Daleks: Part 1
The TARDIS suffers a power drain and is forced down on the planet Exxilon. Sarah is captured by the primitive inhabitants and the Doctor comes face to face with his oldest enemies.
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E12 • Death to the Daleks: Part 2
The Daleks weaponry is rendered useless by the power drain and they are forced to make a truce with the Doctor and the members of the expedition from Earth.
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E13 • Death to the Daleks: Part 3
The Daleks force the Exillons to work as slave labour to mine the life saving parrinium. The Doctor and Bellal brave the puzzles and traps of the Exxilon city.
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E14 • Death to the Daleks: Part 4
The Doctor and Bellal arrive at the centre of the Exxilon city but the Daleks are preparing to depart and launch a deadly plague missile that will kill everyone left behind.
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E15 • The Monster of Peladon: Part 1
The Doctor makes a return visit to Peladon some years after his previous visit. There he discovers that several miners have died and the ghost of Aggedor is to blame.
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E16 • The Monster of Peladon: Part 2
Chancellor Ortron accuses the Doctor and Sarah of being in league with the rebel miners and sentences them to be punished by Aggedor himself.
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E17 • The Monster of Peladon: Part 3
Desperate to avoid a revolt from the miners, the Doctor attempts to expose the fraud of Aggedor’s ghost. Alpha Centauri has summoned Federation troops, but whose side are they on?
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E18 • The Monster of Peladon: Part 4
The Ice Warriors have taken control of Peladon. Pretending to cooperate, the Doctor concocts a plan to defeat the invaders.
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E19 • The Monster of Peladon: Part 5
Commander Azaxyr and his Ice Warriors are revealed as traitors, in league with Galaxy 5. The Doctor intends to turn Aggedor against Azaxyr, but it may already be too late.
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E20 • The Monster of Peladon: Part 6
The Doctor and the miners take the upper hand in the fight to reclaim Peladon from the Ice Warriors. But Eckersley is unwilling to give up and takes Queen Thalira hostage.
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E21 • Planet of the Spiders: Part 1
The Doctor receives a mysterious package from his old companion, Jo Grant. Sarah joins Mike Yates to investigate sinister events at a Buddhist meditation centre.
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E22 • Planet of the Spiders: Part 2
Lupton, now under the control of a giant spider, infiltrates UNIT HQ and steals the Metebelis crystal. But the Doctor is unwilling to give it up so easily and a chase begins.
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E23 • Planet of the Spiders: Part 3
Following Lupton, Sarah is transported to Metebelis 3 where she is captured by the human villagers. The Doctor uses the TARDIS to follow Sarah, but the spiders are waiting.
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E24 • Planet of the Spiders: Part 4
With the Doctor in a coma, his only hope of survival lies with a device inside the TARDIS. Sarah is captured by the spiders and is held prisoner in their larder.
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E25 • Planet of the Spiders: Part 5
Sarah makes a bargain with the Queen Spider and returns to Earth with the Doctor in the TARDIS. There they meet K’anpo, the Doctor’s Time Lord guru who has the Metebelis crystal.
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E26 • Planet of the Spiders: Part 6
The Doctor takes the blue crystal and returns to Metebelis 3 where he must face the spider ruler, the Great One. But it is an encounter that he may not survive.
