Starring William Hartnell as the first Doctor, this early four-part adventure is available on DVD for the first time. The story begins in London, 1966 and the TARDIS materialises in the shadow of the newly-completed Post Office Tower in London. Immediately the Doctor senses a strange energy in the air and is certain evil is at work nearby.

Posing as a scientist, the Doctor and his ‘secretary’ Dodo (Jackie Lane) gain access to a suite at the top of the tower and meet the driven Professor Brett (John Harvey). His life's work, WOTAN – a revolutionary new supercomputer that can actually think for itself – is about to be linked up with computers from around the world to create an advanced problem-solving network. But WOTAN has its own agenda. Convinced that humans are inferior to machines, WOTAN is determined to create an army of war machines to take over the world. Can the Doctor find a way to outwit this menacing computer foe?

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