The Season 3 is an expected season inside Between, mainly by its mysterious final in Season 2.
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Since 5 years from the last release date of an Between episode, there have been no new announcements about a possible season 3 for Between, making Betweeners ask themselves when a possible third season would be released. We expect that owing to the negative reviews of the second episodes, the makers wouldn't announce a new season (see Season 1#Reception).[1]