When it comes to genre mash-ups, sci-fi and horror remain a fan favorite, and one that has proven difficult to approach; for every Alien and The Thing, there are hundreds of failed attempts by filmmakers to make a name in the subgenre. Much of the most acclaimed sci-fi horror originates from the '80s and beyond, with the genre continuing to evolve today. However, there has been a push to meld the two genres together since the 1930s. To highlight pioneering films, entertaining outings, and cult gems in the sci-fi horror genre, we will examine pre-1980s films that remain worth watching today.

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