Case File Four (webcast)

Spiders are eight-legged creatures.
The mutant spiders grew to giant size with extra-strong webs. They could sense prey through vibration.
Yaz states that she has never been afraid of spiders.
Yaz heard that one is never more than three metres away from a spider.
There are 21 quadrillion spiders on Earth.
The spiders were found not on an alien planet but in Sheffield, Yaz's home city.
Park Hill was "spider central".
Yaz's family consists of her sister Sonya, her father Hakim and her mother Najia, who had got a job as a general manager at a luxury hotel where toxic waste was hidden.
Spiders taste and smell through their legs, give out pheromones and hate garlic.
The mutant spiders liked the grime music played by Ryan Sinclair from "Sheffield's sickest grime station".
Jack Robertson and a map of Sheffield are also seen.
The Thirteenth Doctor pointed out that the spiders were also living creatures, teaching Team TARDIS to respect life.