Back on Earth, the newly-formed United Nations Intelligence Taskforce, led by Brigadier Lethbridge-Stewart, is disturbed by a series of UFO sightings over Southern England.

Manwhile, a large consignment of mysterious crates is delivered to International Electromatics, the largest computer and electronics form in the world.

Three seemingly unconnected events - but in reality the preparations for a massive Cyberman invasion of Earth with one aim - the total annihillation of the human race.
 

Following his first appearance in 1968 in the Web of Fear, Brigadier Lethbridge-Stewart became a firm favourite with Doctor Who's many viewers. So, in this 30th Anniversary year, it is fitting that he should return - this time in the guise of his actor-creator Nicholas Courtney. On this special double video, Nicholas introduces the character's second appearance, his narrative bridging the gaps in this original 8 part adventure left by the loss of episodes 1 and 4. Originally broadcast 2 November - 21 December 1968, The Invasion can go ahead at last on BBC Video...

When the Doctor, Zoe and Jamie investigate the mysteriopus disappearance of an eminent scientist, their search takes them to International Electromatics, a powerful firm run by the sinister Tobias Vaughan. Under surveillance by the Brigadier's top secret United Nations Intelligence Taskforce (UNIT) , it soon becomes apparent that there is more to Vaughan's activities than meets the eye. Just who are his mysterious allies? What is lurking down the sewers of London? Is the Doctor ready to face an old enemy once more?

Running time: 148 mins approx.

Produced by Peter Bryant
Directed by Douglas Camfield
Video Producer: John Nathan-Turner
Cover Illustration by Andrew Skilleter