Sutcliffe (Thin Ice)

Lord Sutcliffe was a business man of sorts, who utlised a sea serpent underneath the River Thames by feeding it humans attracted to the frost fairs who were eaten by the creature. It would later defecate feces which could burn for longer and hotter than coal, even underwater which was greater than anything they had at the time of the Industrial Revolution. He kept the creature chained up underneath the Thames and as a result would cause the Thames to freeze over. Sutcliffe used this to lure people into the frost fairs which he'd feed the creature with and carry on producing his fuel.

On 8 February, 1814, the first frost fair in years had arrived. As the frost fairs were becoming a rare occurrence he planned to detonate an explosive which would crack the ice and feed everyone in it to the creature to carry on his fuel. The Twelfth Doctor and Bill allowed people to get off the ice and use the explosives to free the creature. As a result the ice cracked but only Sutcliffe was on it to fall in and drown. (TV: Thin Ice)