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Currently you are able to watch "Merlin - Season 3" streaming on Amazon Prime Video, Amazon Prime Video with Ads or for free with ads on Tubi TV. It is also possible to buy "Merlin - Season 3" as download on Apple TV.
Merlin is available to watch for free today. If you are in Canada, you can:
Swords, sorcery and swashbuckling adventure return in the third series of Merlin, following our heroes as they face their greatest challenge yet. When misbegotten secrets are exposed and old friends choose new sides, they soon discover that the great battle for Camelot is only just beginning...