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The Chain Reaction is a 1980 Australian science fiction thriller film directed and written by Ian Barry. The film stars Steve Bisley and Arna-Maria Winchester. The film's plot is about an engineer badly injured in an accident caused by an earthquake. He knows that the nuclear waste will poison the groundwater and wants to warn the public. The movie features many cast members from Mad Max, among them Mel Gibson as a bearded mechanic, in an uncredited cameo. imdb.com