The Invasion is the third serial of the sixth season of the British science fiction television series Doctor Who, which was first broadcast in eight weekly parts from 2 November to 21 December 1968.
After being fired upon, the Doctor, Jamie and Zoe land a damaged TARDIS in London and go to find Professor Edward Travers for his assistance. They discover Professor Travers has leased his house to Professor Watkins & his niece Isobel.
The professor has gone missing while working for a shadowy electronics company called International Electromatics. The Doctor and Jamie leave to investigate its head office, where they meet Tobias Vaughn, the company’s Managing Director, and Brigadier Alastair Lethbridge-Stewart head of a military taskforce called UNIT, which investigates unusual activities around the world.
Taken to the company’s countryside base, the Doctor and Jamie meet the Professor, who is working on a “Cerebration Mentor” device, intended to be a teaching machine. The professor reveals that Vaughn is working with an unspecified ally and that they are planning to take over the world. Further investigation reveals this ally as the Cybermen, who intend to send a hypnotic signal through the devices produced by International Electromatics, which will incapacitate the world’s population and nullify resistance.
In the nick of time the Doctor is able to protect his companions and their UNIT allies with specially-made depolarizers that neutralize the Cybermen’s signal. As the Cybermen take over, the Brigadier arranges for the Doctor and company to be transported to UNIT headquarters in Geneva to help battle the invasion.
After completing production on more depolarizers, the Doctor leaves to confront Vaughn in London whilst UNIT works to stop the Cybermen. Uncovering Russian plans to launch a rocket at the ship sending the signals, Turner leads a squadron to assist them whilst Zoe helps the Brigadier predict the Cyberfleet’s movements. Using British artillery, they are able to destroy the full fleet, causing the Cybermen to turn on Vaughn and decide to destroy Earth with a megatron bomb.
His plans ruined, Vaughn agrees to thwart the invasion and helps the Doctor locate the homing signal. With UNIT sending troops to help, they defeat the Cybermen guarding the beacon and turn it off, though Vaughn is killed in an ambush. The megatron bomb is destroyed by an anti-missile defence rocket, while the Russian rocket destroys the Cybership broadcasting the hypnotic control signal, ending the invasion.
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To view the list of other Doctor Who serials, please click this link
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