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This "Doctor Who" spinoff series features a young cast that includes Greg Austin and Fady Elsayed in lead roles. Four students at Coal Hill School in London navigate through teenage life, from schoolwork to dealing with their parents, friendships and romances. Coal Hill School holds many secrets, as years of time-traveling has transformed the building, thinning its walls and making it more susceptible to external dangers. The Shadow Kin, a creature that lurks beyond the facility's walls, threatens to destroy the students' world.