The opening desert material exposed the production's effects problems almost immediately. Fox had constructed a missile-base set near Borrego Springs, California, and attempted to stage an attack by enormous, eight-foot-long scorpions using full-scale mechanical or practical props. The creatures did not move or photograph convincingly, and the resulting footage was rejected. The filmmakers ultimately had to composite real scorpions into live-action material through blue-screen optical effects, an awkward solution that reflected the film's larger technical predicament: its screenplay demanded a post-nuclear world of giant insects, radioactive skies, catastrophic storms, and mutated landscapes at a time when the required effects methods were still expensive and unreliable. The later cockroach sequence suffered a similar fate, mixing live Madagascar hissing cockroaches with rubber insects whose visible pulling strings made the illusion conspicuously artificial.
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