Under the Dome End Date Set, Series Finale to Air Sept. 10

It’s three and done for Dome.

CBS announced Monday that Under the Dome will not be back for Season 4, meaning the Sept. 10 Season 3 finale will now be a series finale. And the network is promising closure.

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“In the series finale, when the Dome comes down, many questions about its origin and power will be answered,” per the episode’s just-released logline, “as two groups of residents engage in one final conflict that some won’t survive.”

Under the Dome opened in June 2013 with a boffo 13.5 million total viewers, and by its freshman finale was still pulling 12.1 mil. Season 2 averaged 7.2 million weekly viewers, while its current run — airing Thursdays versus Mondays — hasn’t come close to even 6.5 million viewers. At last tally, it drew 4.6 mil with a 0.9 demo rating, after hitting series lows.

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“Two years ago, Under the Dome broke new ground in the summer and became an instant hit on CBS, as well as with viewers around the world,” said Nina Tassler, Chairman, CBS Entertainment, in a statement. “Dome’s event storytelling and multi-platform business model paved the way for more original summer programming with the successful rollouts of Extant and Zoo. We’re excited to present the final chapter in Chester’s Mill as the story comes full circle, with the Dome coming down as dramatically as it went up.”

Thoughts? Is Dome packing it in at the right time? Or did it run one (or two) seasons too long? Hit the comments (after you watch the series-finale promo below)!

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