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Inspector Mackenzie was an officer of the Metropolitan Police Service who was sent to Gabriel Chase to investigate the disappearance of Sir George Pritchard.

Mackenzie arrived at the house during or prior to 1883. Josiah Samuel Smith used hypnosis on him and put him into suspended animation in a drawer. In 1883, the Seventh Doctor revived him by clicking his fingers constantly in front of his face.

Following his awakening, Mackenzie had a voracious appetite and ate "three English breakfasts, two elevenses and one four-course meal" — as pointed out by the Doctor. Also, on first entering the drawing room, Mackenzie was eating a beef sandwich, some of which he spat onto the Doctor's jacket when asking, with his mouth full, about the Neanderthal butler Nimrod.

Mackenzie then set about continuing the murder investigation and soon reasoned that something was not right. After Light woke and decided to destroy all life on Earth, he killed Mackenzie and devolved him into primordial soup, a tureen of which he served to Smith and his dinner guests. When Light lifted the soup ladle, Mackenzie's medallion was dangling from it, and he referred to the soup as being "the cream of Scotland Yard". (TV: Ghost Light)

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