Case File Four (webcast)

Case File Four, subtitled Mutant Spiders, was released online in 2018, alongside Arachnids in the UK.

Synopsis
Yaz gives a detailed report on the giant spiders, their history and her encounter with them.

Cast

 * Yasmin Khan - Mandip Gill

Crew

 * Writer - Jacqueline Rayner

Worldbuilding

 * 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

 * Case File Four uses imagery from the television story Arachnids in the UK.

Continuity

 * Yaz recaps Team TARDIS' encounter with the mutant spiders. (TV: Arachnids in the UK)