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Currently you are able to watch "Attack of the Unknown" streaming on Tubi TV for free with ads or buy it as download on Apple TV, Google Play Movies, YouTube. It is also possible to rent "Attack of the Unknown" on Apple TV, Google Play Movies, YouTube online
Attack of the Unknown is available to watch for free today. If you are in Canada, you can:
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A SWAT team transporting a vicious crime syndicate boss must fight their way out of a county detention center during a catastrophic alien invasion.