Amos (The Crimson Horror)

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You may be looking for the Amos from Byzantium!.

Amos worked at a morgue near Sweetville. He identified several victims that were found in the canal had been afflicted by the "crimson horror". Looking at a glass containing some of the poison, Madame Vastra recognised the symptoms as coming from the red leech, 65 million years earlier. (TV: The Crimson Horror)