The film notably never answers where the Graboids came from, the characters only speculate about it. Co-writer and producer S.S. Wilson felt that there were only four possible options: they were aliens, long-dormant prehistoric life, worms mutated by radioactive waste, or creatures genetically engineered by Government funded mad scientists. Since the more savvy moviegoers would be expecting those twists, the filmmakers felt it would be more interesting (and would leave room open for sequels) if there was no definitive answer and the audience was left to wonder.

Film

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