.:About:.

Harry Sullivan is a fictional character from the British science-fiction television series Doctor Who and is a companion of the Fourth Doctor. Played by Ian Marter, the character appears as a regular during the programme's twelfth season in 1974–1975.

Harry is a doctor in the Royal Navy, who is attached as medical officer to the United Nations Intelligence Taskforce, the military organisation to which the Doctor acts as scientific advisor. He is first mentioned (though not seen) in Planet of the Spiders, when the Brigadier thinks the Third Doctor has gone into a coma. The Brigadier calls "Doctor Sullivan" and asks him to come to the Doctor's laboratory, but tells him not to bother when Sergeant Benton wakes the Doctor by offering him a cup of coffee. In the next serial, Robot, after the Doctor's third regeneration, Sullivan is called in to attend him, and ends up travelling aboard the TARDIS with the Fourth Doctor and Sarah Jane Smith (played by Elisabeth Sladen) for several subsequent adventures.

Harry is rather old-fashioned and stereotypically English in his attitudes. He often employs slightly archaic language — for example, referring to Sarah affectionately as "old thing". He is nonetheless depicted as possessing great bravery and a "can-do" attitude, adapting well to the many strange situations in which he finds himself. He can, however, also be quite clumsy and unsubtle, leading the Doctor to once declare, in a moment of frustration, that "Harry Sullivan is an imbecile!" Nonetheless he is well-liked by the Doctor and Sarah, and has a slightly flirtatious relationship with the latter.