Got cancelled after one season and fans have been in a state of mourning for twenty-odd years now.
Fun fact: Fox cancelled the show after airing just 11 of 14 produced episodes, then it spawned a feature film.
Sixty years of running down corridors and somehow the budget for the wobbly sets is still part of the charm.
Fun fact: The BBC wiped 97 episodes from the 1960s to reuse the tapes, and some are still missing.