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Engineer Mitch MacAfee spots a UFO while directing a study at the North Pole. But when the Air Force arrives, they cannot find anything visually or on radar, throwing Mitch's reputation into doubt. Soon, though, many airplanes are reporting attacks by a UFO, which turns out to be a giant speeding bird from outer space. Along with mathematician Sally Caldwell, Mitch tries to determine a way to stop the bird, which has a force field that renders all weapons useless.
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