Case File One (webcast)

The Stenza originate 5000 galaxies away from Earth.
The Stenza are the conquerors of the Nine Systems.
The Stenza came to Earth to hunt humans. Calling it the ritual of the Stenza, they have gotten away with it for years.
The ritual led Tzim-Sha, nicknamed Tim Shaw by Team TARDIS, to Sheffield.
Stenza warriors such as Tzim Sha use armour to scan their surroundings and adapt to the environment.
Tzim Sha's face is covered with teeth taken from his victims, representing his conquests.
Stenza's skin are ice cold and so can kill with a touch.
Tzim Sha used a "mega-cold" transport pod to travel to the Peak District.
Ryan Sinclair found the transport pod and called the police, which led to Yasmin Khan being involved.
The gathering coil was a half organic machine which was used by Tzim Sha to locate his human target.
The gathering coil implanted DNA bombs.
Karl, Rahul and the recall circuitry are seen.
The Thirteenth Doctor defeated Tzim Sha, but not before offering him a chance to change.