The Daleks invade Earth, and begin drilling to the earth's core in Bedford.
The TARDIS materialises in London sometime after the year 2164. Dalek invaders are now ruling the Earth with the aid of humans converted into zombie-like Robomen, but they are opposed by a group of resistance fighters led by the wheelchair-using Dortmun.
The travellers discover that the Daleks have established a huge mine in Bedfordshire, their aim being to remove the Earth's core using a huge bomb and replace it with a powerful drive system so that they can pilot the planet around the galaxy. Ian manages to create a barrier in the shaft in order to intercept the bomb. The resulting explosion destroys the Daleks and their mine and creates a huge volcanic eruption.
Susan has fallen in love with resistance fighter David Campbell, and the Doctor decides to leave her on Earth to find a new life with him, while he continues on his travels with Ian and Barbara.
While Planet of Giants must be deemed a partial failure, the same certainly cannot be said of The Dalek Invasion of Earth, which surely ranks as one of the series' all-time greats.
Terry Nation's scripts are impressive, presenting an action-packed good-versus-evil struggle. The return of the Daleks was very much by popular demand and generated considerable excitement amongst viewers at the time, as is apparent from the following description in the BBC's Audience Research Report on the first...