The TARDIS arrives in London in 1966 and the First Doctor and Dodo visit the Post Office Tower. There they meet Professor Brett, whose revolutionary new computer WOTAN (Will Operating Thought ANalogue) can actually think for itself and is shortly to be linked up to other major computers around the world — a project overseen by civil servant Sir Charles Summer.
Director: Michael Ferguson
Writer: Ian Stuart Black
Producer: Innes Lloyd
The Doctor
Dodo Chaplet
Polly
Ben Jackson
Professor Brett
Professor Krimpton
Sir Charles Summer
Major Green