Spontaneous human combustion referred to cases where humans ignited without apparent reason. According to Mike Yates, it was ten times more likely to happen to UNIT soldiers than civilians. (PROSE: No Future)

At some point during the 1890s, a spate of at least nine human combustions were reported in Victorian London. This case was pursued by the newly regenerated Twelfth Doctor and the Paternoster Gang after witnessing a tyrannosaurus rex the TARDIS had brought to London spontaneously combust. It was revealed to be the work of the Half-Face Man and his Clockwork Droids, who had their victims incinerated to mask the organ harvesting they performed. (TV: Deep Breath)

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