The third and final season of Under the Dome, an American science fiction mystery drama television series, premiered on CBS on June 25, 2015,[1] and ended on September 10, 2015.

Military forces, the government, and the media positioned outside the barrier attempt to break it down, while the residents trapped inside must find their own ways to survive with diminishing resources and rising tensions.

With only very few people not having entered the alternate reality and not having been cocooned, a war inside the Dome is set up between The Kinship and the Resistance.

With the Dome's power source gone, it starts to calcify, severely limiting oxygen and posing a threat to both The Kinship and The Resistance.

[11] During a CBS press briefing in May 2015, showrunner and executive producer Neal Baer promised answers in the new season.

[15] In an interview after the series finale aired on September 10, 2015,[16] executive producer and showrunner Neal Baer said he was "very happy with this ending.

He plays Hektor Martin, the ruthless CEO of Aktaion Energy, the company run by Barbie's father, and also directed the ninth episode of the season.

[18] In a June 2015 interview with The Hollywood Reporter to discuss season three, Neal Baer commented on the "less-than-favorable" critical reception to previous episodes.

Positive reviews included Ken Tucker of Yahoo!, who wrote that "Under the Dome is certainly broadcast television’s most enjoyable science-fiction/fantasy series, a summer treat that, while sometimes silly and over-the-top, is never less than energetically imaginative and aware of the history of its genre",[4] Scott Von Doviak of The A.V.

[32] Negative reviews included Kevin Yeoman of ScreenRant, who wrote that "There is a certain joy that comes from watching something as consistently moronic as Under the Dome",[33] and Tim Surette of TV.com, who wrote that "it takes balls to think your audience is so dumb and brain dead that you feel the need to explain the big twist in the episode that's about to happen before the episode even begins".