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You can watch Frequency (2000) for free on Kanopy.

When a rare phenomenon gives police officer John Sullivan the chance to speak to his father, 30 years in the past, he takes the opportunity to prevent his dad's tragic death. After his actions inadvertently give rise to a series of brutal murders he and his father must find a way to fix the consequences of altering time.

John Sullivan risks fracturing his own timeline when a chance radio connection allows him to warn his late father about a serial killer. This temporal race against time turns a single conversation into a frantic battle to rewrite a tragic history.

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