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You are able to buy "Under the Dome - Season 3" on Apple TV as download.
There are no options to watch Under the Dome for free online today in Australia. 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.
The residents of Chester's Mill appear both inside and outside the Dome following their mysterious encounter in the tunnels beneath the town. As the Dome begins to reveal its ultimate agenda, the townspeople are forced to question what and whom they can trust as fresh threats appear, new residents emerge and surprising alliances form.