Time travel, flying saucers, and so many stabbings. That can make for an exciting movie, but when it comes out of nowhere, it also ruins them. These terrible endings ruined some sci-fi masterpieces.

The Golden Age of Hollywood produced some of the best films in every genre, but the science fiction from that era is particularly memorable. Going back to the beginning of cinema, sci-fi has played an ...

We asked our readers to name their favourite films in the sci-fi genre – and these were the titles that came up most often.