Case File Four, subtitled Mutant Spiders, was released online in 2018, alongside Arachnids in the UK.
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- 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.
Story notes Edit
- Case File Four uses imagery from the television story Arachnids in the UK.
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