Hex (2004)

Sky One's homegrown answer to the American supernatural shows: a withdrawn girl at a remote English boarding school discovers dangerous powers, and a fallen angel called Azazeal takes a close interest. That angel is played by Michael Fassbender years before Hollywood stardom, which alone makes it worth tracking down. Hex lasted two series and 19 episodes before its cancellation in 2006, and the second series feels different after Fassbender and Christina Cole left.