Mr Sin
The Peking Homunculus, also known as Mr Sin, was a murderous cyborg.
History
The Peking Homunculus was a 51st century cyborg made in Peking for the commissioner of the Icelandic Alliance. It was made as a toy, a plaything for his children. It contained a series of magnetic fields on a printed circuit, a small computer, and a single organic component - the cerebral cortex of a pig. (DW: The Talons of Weng-Chiang)
It played a key role in history when the pig part took over and almost caused World War VI, then disappeared. It later showed up in the possession of Magnus Greel, a fugitive war criminal from the fallen Supreme Alliance. He took it with him to the 19th century. Armed with a knife, it did his bidding.
During the final battle between the Fourth Doctor and Greel, Mr Sin, whom Greel had unwisely allowed access to a laser rifle, became trigge-happy and fired at anyone who moved, including Greel's men and Greel himself. The Doctor finally threw it to the ground and tore out its fuse. (DW: The Talons of Weng-Chiang)
Sherlock Holmes later investigated Mr Sin, terming it The Affair of the Walking Ventriloquist's Dummy, but was unable to solve the matter. (NA: All-Consuming Fire)
Sin was later reactivated by Hsien-Ko Chang, the daughter of Greel's former ally, Li H'sen Chang, using the prototype control fuse and brains from a slaughterhouse. Hsien-Ko believed that she could use Sin as a weapon the way Greel had failed to do so. Although she maintained a tighter hold on Sin's more violent tendencies — disguising him as a child to avoid attracting attention — she lost control when he was damaged in a fight at her base. In the subsequent fight, the Doctor decapitated Sin. K9 later destroyed the cyborg's head to prevent it ever being reactivated. (MA: The Shadow of Weng-Chiang).
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