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A film which was based on the first Cyberman invasion of Earth was shot by Lloyd Kingsley-Sayle.
At the request of Brigadier Lethbridge-Stewart, the Second Doctor posed as a scientific advisor on the set. The Brigadier was concerned that the movie would reveal too much about UNIT. By this point, the general public did not remember how UNIT knew it happened, but enough remembered something to start getting suspicious if the film were stopped. The Doctor "correct[ed]" events in the film while also making friends with Lloyd's seven-year-old daughter Kate, who had been kidnapped for a week the last year and returned mysteriously.
The Doctor made changes to the film script, amending details of the invasion and most importantly changing the name of the unknown invaders to the fictional Zexians. Other differences included the invaders arriving by water pipes instead of sewers, there being sixty-four landing sites, not just London, and that Tobias Vaughn had a troubled childhood, explaining his motivation for helping the aliens. Tobias Vaughn was portrayed by an actor named Michael.
As the Doctor worked, a Cyber-infiltration unit recorded his suggestions and evaluated their success rate for an invasion of Earth. The Cybermen had been monitoring the film's progress through an implant in Kate's skull that they put in when they kidnapped her. After several changes to the script, the success rate for invasion reached 100 percent. However, the Doctor had been aware of what was happening all along, entered the control room, and suggested that the Cybermen leave Earth before UNIT arrived to destroy them. Kate then undergone a successful surgery to remove the implant. (PROSE: Scientific Adviser)