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Currently you are able to watch "Ultimate Ninja Challenge" streaming on Discovery +, Discovery+ Amazon Channel or buy it as download on Apple TV.
There are no options to watch Ultimate Ninja Challenge for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when show is available to watch for free on streaming services and TV.
In the Pacific Northwest wilderness, nine modern-day warriors compete in a 24-day survival challenge based on the ancient laws of the Ninja.