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Currently you are able to watch "Ultimate Ninja Challenge - Season 1" streaming on Discovery+ Amazon Channel or for free with ads on Discovery+.
Ultimate Ninja Challenge is available to watch for free today. If you are in India, you can:
Grandmaster Hatsumi is the last true ninja left on earth and he plans to select an heir to his ninja dynasty before he dies. For 30 days, Hatsumi's fiercest disciples will live off the land, surviving the elements while also enduring the most grueling training in the history of man.