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An unidentified missile moves through space, nearing Earth. One nation fires a rocket at it, but this only diverts the missile into the atmosphere, where it begins tearing up everything in its path. As it heads towards Ottawa and then New York City, the Canadian and U.S. military are mobilized, but they can't halt its progress. A scientist (Robert Loggia) and his fiancée (Ellen Parker), though, have been working on a hydrogen warhead that may be able to hit the missile and save the Earth. Wikipedia