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Naval Lieutenant Harry Sullivan was the UNIT medical officer who oversaw the Doctor's recovery after his third regeneration, although unfortunately his ability to innocently cause near-catastrophes amde the Doctor explode on one occasion, "Harry Sullivan is an imbecile!'. He helped the Doctor find the metal-eating virus that was used to destroy the giant robot, K1 (4A).

He accepted the Doctor's invitation to travel in the TARDIS, although he caused the Ship to go off course and land on Nerva Beacon (4D).

He was a "four square" fellow who believed in playing by the rules, and always saw the good side in everybody. Harry was very gentlemanly and slightly archaic in his attitudes towards women, Harry helped defeat the Wirrn, the Sontarans, the Daleks, the Cybermen and the Zygons.

It was after the Zygon's failed attempt to invade Earth that he decided to stay behind now that he was back in present day Earth. The Doctor though did offer him a lift back to London in the TARDIS but he declined much preferring to make his own way there. However, the Doctor and Sarah caught up with him again during the Kraals invasion of Earth . It was also during this story the Doctor and Sarah also encountered an android replica of Harry created by the Kraals (4J).

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Born in 1944 Ian Marter's acting career started when he left university in 1969 to join the Bristol Old Vic as an acting stage manager. His first professional acting part was as a Russian soldier in "The Hostage".

He auditioned for the role of Captain Mike Yates but this part was given to Richard Franklin instead. However, he still made an impression and so his first role in "Doctor Who" was when he played the part of merchant navy officer John Andrews in the 1973 Third Doctor story "The Carnival of Monsters".

He was then given the opportunity to join Doctor Who in 1974 as companion Naval Surgeon Lieutenant Harry Sullivan. Since leaving Doctor Who Ian Marter then became involved in novelising several "Doctor Who" stories for the Target range of books including the original novel "Harry's Sullivan's War".

He also developed, with Tom Baker, an idea for a film called "Doctor Who Meets the Scratchmen". He has also novelised several films including "Baby", "Splash", under the pen name Ian Don, "My Science Project" and "Down and Out in Bevely Hills".

Ian also returned to the stage appearing in such plays as "Conduct Unbecoming", "Ableard and Heloise", "The Importance of Being Ernest", "The Rivals", The Knack", The Baggage" and " The Architect and the Emperor of Assynia" .

Ian also appeared in differant roles in several well know TV series including "The Brothers", "Hazel" in the episode "Hazel and the Big Sleep" (1979), "Shine on Harvey Moon" (1984), and "Bergerac" in the episode "Return of the Ice Maiden".

Unfortunately, on 29 October 1986 and before he had completed the novelisation of the 1965 Doctor Who story "The Rescue", he suddenly passed away as a result of a diabetes related illness. The novel was subsequently completed by Nigel Robinson, the editor of the range of books at the time. This was only 6 weeks after his last work in front of a camera for his lengthy interview in the Reeltime Picture's "Myth Maker" series.

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