Geoff Sinton was the husband of Linda Sinton and the father of Stuart and Richard Sinton. He lived in London with his family. One day the Fourth Doctor and Harry Sullivan came to his house to use his television. He allowed them to stay at his home whilst they made contact with an alien war marshal called Kathnor, who was holding the Doctor's other friend hostage. He was bewildered by the whole situation. After they had used his television to establish contact, the Doctor and Harry left the Sinton home, which left Geoff curious as to who they were in the first place. (PROSE: The Last Broadcast)

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