nightclub, where he discovers a War Machine, now fully assembled. Ben is detected by the Machine, and caught by the now hypnotised Polly. Ben learns that the War Machines are to attack at noon the next day. He escapes and alerts the Doctor and Sir Charles. Polly is sent back to the Tower to be punished by WOTAN. Under Sir Charles's instruction, an army taskforce investigates the warehouse. They are forced to retreat, but when the Doctor stands before the Machine, it stops—it had not been completely programmed. Soon after, there are reports of another War Machine—Machine 9—taking to the streets. The Doctor traps the Machine in an electromagnetic forcefield and reprogrammes it to destroy WOTAN. Ben goes to the Post Office Tower and drags Polly out of the WOTAN room as the Machine enters and attacks the immobile computer. Krimpton is killed, but WOTAN is destroyed before it can give the order for the other ten War Machines to commence their attack. Brett and all the others who have been hypnotised return to normal. Ben and Polly meet the Doctor at the TARDIS, to explain that Dodo has decided to stay in London. The Doctor thanks them and heads into the police box—followed by Ben and Polly. They are then suddenly whisked off into time and space. Production Working titles for this story included The Computers. The idea for this story came about when Kit Pedler was being interviewed for a position as science adviser to the series. The producers asked all of the interviewees what would happen if the recently built Post Office Tower somehow took over. Pedler suggested that it would be the work of a rogue computer that communicated with the outside world by means of the telephone system. The producers liked this suggestion and not only offered Pedler the job but developed the idea into a script (one of the few to feature a 'Story Idea by' credit). Pat Dunlop was then hired to write a full set of teleplays from Pedler's idea, but quit after becoming busy with other work, and the teleplays were subsequently done by Ian Stuart Black, who had also written the previous serial, The Savages. Only one War Machine prop was actually constructed; the production team changed the numbers, to represent the different machines. The titling style of each episode in this serial differs from the standard titles of other