Planet of the Daleks is the fourth serial of the tenth season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 7 April to 12 May 1973.
The Third Doctor has been wounded after being shot by the Master. Jo helps the Doctor into the TARDIS, where he sends a message to the Time Lords before he collapses then falls into a coma. The Time Lords direct the TARDIS to the planet Spiridon, where Jo leaves the TARDIS in an attempt to find help, and encounters a party of Thals, the Daleks’ oldest enemy.
The Thals rescue the Doctor from the TARDIS, the outside of which has been overtaken by a lethal fungus, and explain to the Doctor that the Daleks have set up a research base on the planet to gain the native Spiridons’ power of invisibility.
The Thals take the Doctor back to their ship, but the Daleks arrive first, destroy the ship and capture the Doctor. He presumes Jo to be dead, but fortunately she had already been removed from the ship by a Spiridon named Wester, having become infected with the fungus, which Wester cures.
As the Doctor is held captive in the Dalek base, another party of Thals arrives and informs the first group that their intelligence had been mistaken; there isn’t just a small research team of Daleks on the planet, but an army of ten thousand, which will form a galactic invasion force.
As the Doctor and a fellow captive Thal break out of their cell, the other Thals break into the base, and the Doctor confirms the existence of the Dalek army, before the group escapes and reunites with Jo and Wester. The Doctor realises that making use of the planet’s natural ice volcanos will be key to defeating the Daleks. Meanwhile, a Dalek ship commanded by a Supreme Dalek lands on the planet, and the Supreme executes the lead Dalek for failing to deal with the Doctor and the Thals.
The group sneaks back into the base, where the Daleks are preparing a bacterial weapon in a laboratory chamber to destroy all life on the planet. However, Wester unleashes the weapon prematurely, ensuring he is its only casualty and creating a no-win situation for the Daleks, where those previously inoculated in the laboratory cannot leave or open the chamber, lest they infect their bretheren.
The Doctor, Jo, and the Thals return to the cavern where the Dalek army is being brought out of stasis, and the Doctor sets off an explosion that floods the entire base with liquid ice, freezing the army. The Thals take the Supreme Dalek’s ship to return to their home world of Skaro, while the Doctor and Jo narrowly get away in the TARDIS, though the Supreme Dalek vows that they are not defeated, and that they will someday thaw their army back out.
The Doctor offers to take Jo anywhere in time and space, but after their recent adventures, Jo is happy to go back to Earth.
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To view the list of other Doctor Who serials, please click this link
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