"Loch Henry" is the second episode of Black Mirror season 6, and the eerie tale features a small ensemble cast of noteworthy actors. In the episode, a pair of documentary filmmakers travel to a remote Scottish village to film the local nature but soon find themselves entangled in the story of the town's dark past. Penned by showrunner Charlie Brooker and directed by Sam Miller, the episode isn't as tech-centric as the usual Black Mirror fare, but "Loch Henry" puts its emphasis on the past in order to make commentary about issues in the present day.

https://screenrant.com/black-mirror-loch-henry-cast-character-guide/