Case File Ten, subtitled The Ux, was released online in 2018, alongside The Battle of Ranskoor Av Kolos.
- The Ux are a duo-species of dimensional engineers with lifespans lasting millennia.
- The Ux can create matter and affect the shape of universe by thought. According to the Thirteenth Doctor, the Ux can create "pretty much" anything by thinking about it.
- The eyes of the Ux turn golden when they use their powers.
- Team TARDIS met the Ux Andinio and Delph, mentor and mentee respectively.
- The Ux had been on the planet Ranskoor Av Kolos for a very long time.
- The planet was transmitting violent psychotropic waves, requiring visitors to wear a neural balancer to protect their brains.
- The Ux worshipped the Creator, a being for whom they had been waiting for generations.
- A shrine to the Creator took over 3000 years to build.
- Ryan Sinclair and Greston Paltraki are also seen.