10 TV Shows Which Completely Changed Their Premise

3. Being Human (U.K.)

The original U.K. version of Being Human was famously marketed with the tagline "a vampire, a ghost and a werewolf share a house in Bristol". It was a sitcom/supernatural horror mash-up which worked brilliantly when its elements cohered and still rather well when they didn't. Series 3 tipped the balance in favour of the supernatural, as werewolf George dealt with threats to his unborn child with girlfriend Nina and the vampire Mitchell became a much darker character. Oh, and it also moved to Wales.

Being Human is perhaps a unique case of a show which lost sight of its premise in one season and managed to reinstate it in the next with a new cast. By the finale of the third series, the show had become a more conventional grim and dark horror for which the original tagline would have felt thematically as well as literally out of place, and the first episode of series four had to work to regain its quirky perspective. It ran for two more successful series, one without any original cast members.