1977 film that spawned three sequels and three prequels (4,4)

I believe the answer is:

star wars

(Other definitions for star wars that I've seen before include "George Lucas's cult sci-fi film" , "Picture" , "Strategic Defense Initiative (US) - sci-fi film" , "Space fiction film - SDI" , "Cult film - Reagan initiative" .)

I've seen this clue in The Independent.

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