Ian Don Marter (28 October 1944 – 28 October 1986) was an English actor and writer, known for his role as Harry Sullivan in the BBC science-fiction television series Doctor Who from December 1974 to September 1975, with a non-regular, one-serial return in November and December 1975. He sometimes used the pseudonym Ian Don. Marter died suddenly in 1986 after suffering a heart attack.
Ian was given the middle name 'Don' in recognition of both parents, as his father's name was Donald and his mother Helen's maiden name was Donaldson.
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Ian and his wife Rosemary had two sons named Rupert and Toby.
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He wrote a few books under the name Ian Don (Don being his middle name).
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During his brief tenure on Doctor Who, he co-wrote the film script of the ultimately-doomed yet well known "Doctor Who meets Scratchman" or as it is also known, "Doctor Who and the Big Game".
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He wrote many Doctor Who Target novelizations, and caused a controversy by using swear words in "The Enemy of the World".
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His fatal heart attack was brought on by Diabetes complications.
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After leaving Doctor Who, he wrote novelizations for many of the serials. He was in the process of writing "The Rescue", when he suffered a hypoglycemic episode while at home alone, went into cardiac arrest and died.