Under The Dome cancelled
Under The Dome season 3 ratings hit series low CBS

The rating for CBS's Under The Dome season 3 has hit a series low and the show is in danger of being cancelled.

According to a report in TV by the Numbers, the most recent airing on 16 July only earned a 0.9 rating, which is down from last week's 1.1 adults 18-49 rating.

There's no word yet from the network on a renewal or cancellation. The most recent renewal for season 3 was announced in October 2014, a few weeks after the season 2 finale aired.

Fans will have to wait until the entire season airs before getting word on whether or not the series will continue, but going by the ratings dip, the show's future is in jeopardy.

The show is based on Stephen King's best-selling novel about a small town that is suddenly sealed off from the world. In the show an invisible dome traps the residents of Chester's Mill inside and cuts them off from the rest of civilisation.

According to executive producer Tim Schlattmann, the trapped townsfolk discover the secrets and purpose of the dome and its origins by the end of season 3.

Schlattmann revealed at the 2015 San Diego Comic-Con, "We are answering all the questions ... by the end of the season," which hints at season 3 being the show's last season.

Tim Schlattman said, "We threw a lot of stuff at you in the first two hours. By the end of the season, you will know everything. I usually don't use this language ... but things are gonna get bananas."

The producer also teased some upcoming deaths. "Sometimes a series can have deaths that don't really mean anything," Schlattmann said. "I think this season, these deaths are really going to matter."

Previously, executive producer Neal Baer stated that fans will learn the purpose of the mysterious and menacing dome in the upcoming season.

"We will tell you why the dome came down and what it's about," Baer promised at a CBS summer press event. "By the end of the season, you'll know exactly why this happened the way that it happened."

Under The Dome's new episode is titled Caged, which will air on 23 July at 10pm on CBS Network.

The official synopsis for episode 6 reads as follows:

When Big Jim is captured by Aktaion, the dangerous private corporation that's descended on Chester's Mill to harness the Dome's energy capabilities, he's forced to manipulate Christine (Marg Helgenberber) for information about her agenda. Also, when Joe and Norrie question the town's new rules, they find themselves in a dangerous face-off with the increasingly unstable residents.