Donald Tosh joined the Doctor Who production team as Script Editor (then titled Story Editor) in 1965. He and John Wiles faced the formidable task of taking over from Verity Lambert and building on the success she had made the series. Thrown in ‘at the deep end’, Donald found himself faced with a cast under pressure as William Hartnell’s health deteriorated and his performance suffered. Despite these problems, Donald supervised some memorable stories including Galaxy 4 and The Dalek’s Master Plan. He was also the first to consider ways of writing William out of the series…