The Invasion (Doctor Who)

In the serial, the megalomaniac Tobias Vaughn (Kevin Stoney), the head of the hugely successful electronics company International Electromatics, forms an alliance with the Cybermen to take control of Earth.

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.

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.

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.

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.

[citation needed] The character of Professor Travers (who appeared in the two earlier Yeti stories) was to have appeared for a third time, but the decision was made to replace him with Professor Watkins as using him would involve paying Mervyn Haisman and Henry Lincoln (who were against their characters' usage after a disagreement over rewrites of The Dominators conducted without their approval), although Travers is still referenced by name several times.

According to Frazer Hines in an interview on the audio CD of The Invasion, Sally Faulkner's skirt kept getting blown up around her neck whilst climbing up the rope ladder to the helicopter.

[3] Due to director Douglas Camfield's refusal to use regular composer Dudley Simpson, Don Harper was hired to do the music for this serial.

^† Episode is missing Paul Cornell, Martin Day, and Keith Topping in The Discontinuity Guide (1995) noted that the serial "shows the advantages of recognisable Earth settings" and described it as "an all action romp".

[6] In The Television Companion (1998), David J. Howe and Stephen James Walker wrote that The Invasion was "one of the very best stories to feature the Cybermen", with praise for Stoney's Tobias Vaughn.

[11] In 2013, Ben Lawrence of The Daily Telegraph named The Invasion as one of the top ten Doctor Who stories set in the contemporary time.

[19] The complete original score, including unused cues and Radiophonic effects by Brian Hodgson, will be released on CD and LP in 2018.

Robert Sidaway with director Douglas Camfield on location during the production
A scene from the animated reconstruction of the missing first episode which was included on the 2006 DVD release of the serial.