The Dalek Invasion of Earth is the second serial of the second season in the British science fiction television series Doctor Who. Written by Terry Nation and directed by Richard Martin, the serial was broadcast on BBC1 in six weekly parts from 21 November to 26 December 1964. In the serial, the First Doctor (William Hartnell), his granddaughter Susan Foreman (Carole Ann Ford), and teachers Ian Chesterton (William Russell) and Barbara Wright (Jacqueline Hill) discover that the Earth in the 22nd century has been occupied by Daleks. They work with a human resistance group to stop the Daleks from mining out the Earth's core as part of their plan to pilot the planet through space. The serial was commissioned following the success of the Daleks from the titular serial of the first season. The serial also marks the final regular appearance of Ford as Susan, having been dissatisfied with the character's development. The writers had considered introducing Susan's replacement within The Dalek Invasion of Earth, but delays in contract renewals forced it to the following serial. The serial was the first major location shoot for Doctor Who, with production taking place at Trafalgar Square, Westminster Bridge, and the Royal Albert Hall. The serial premiered with 11.4 million viewers, maintaining strong viewers across the six weeks. Contemporary reactions were positive, with many praising the return of the Daleks. Retrospective reviews were also positive, with particular praise directed at the first episode's cliffhanger and Susan's emotional departure, though the direction and pacing has been criticised. The serial later received several print adaptations and home media releases. Plot After the TARDIS materialises, the First Doctor (William Hartnell), Susan Foreman (Carole Ann Ford), Ian Chesterton (William Russell), and Barbara Wright (Jacqueline Hill) surmise that they have landed in London, but find it in ruins. The Doctor and Ian stumble across an army of Robomen as a Dalek rises from the River Thames. The Daleks take the Doctor and Ian onboard their saucer. Resistance members explain that the Daleks invaded Earth in the aftermath of a meteorite bombardment ten years prior. Barbara and Susan are taken by refugees to a nearby shelter in an abandoned Underground station, where they meet resistance members who are planning an assault on the Daleks. The resistance leader, paraplegic scientist Dortmun (Alan Judd), has created a bomb to destroy the Daleks' outer casings. Susan, Barbara, and the resistance team attack