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Currently you are able to watch "Callan - Season 4" streaming on BritBox Amazon Channel, BritBox, Britbox Apple TV Channel .
There are no options to watch Callan for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
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Edward Woodward stars as Callan, a brooding assassin for a nameless British intelligence service.