Watch "Under the Dome" season 3 premiere live stream online free here tonight! Episode 1, titled "Move On; But I'm Not" will feature new cast member, CSI's Marg Helgenberger. Meanwhile, "Under the Dome" executive producers promised that fans will learn why the dome came down in season 3! Find out where to watch the "Under the Dome" season 3 premiere live stream online free here.

"Under the Dome" season 3 returns to CBS tonight, June 25. If you can't make it to a TV by 9pm EST to catch the double-episode special premiere, click here to watch online via a free live stream!

If that doesn't work, CBS also offers episodes on their website to watch online the morning after an episode airs.

The first episode is titled "Move On," and the second is called "But I'm Not."

The season 3 premiere, episode 1 synopsis reads: "Season 3 begins with residents of Chester's Mill appearing both inside and outside the Dome following their evacuation into the tunnels beneath the town. Meanwhile, the Dome begins to reveal its ultimate agenda; and surprising alliances form as new residents emerge."

According to Futoncritic.com, another synopsis reads: "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, on the two-hour third season premiere of UNDER THE DOME, Thursday, June 25 (9:00-11:00 PM, ET/PT), on the CBS Television Network. Emmy Award winner Marg Helgenberger guest stars as Christine Price, a Chester's Mill resident with insight into the Dome's origins. Eriq La Salle guest stars as Hektor Martin, the ruthless CEO of the energy company run by Barbie's father."

According to executive producers Neal Baer and Tim Schlattmann, season 3 of the CBS series will answerfans' long-awaited questions.

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

Schlattmann promised that all of those loose ends will be addressed by the end of season 3.

"Why was there 25 years to pass before the dome came down? What was in play 25 years ago that set all this in motion? That's one of the biggies we're going to address," Schlattmann confirmed. "You'll see how these puzzle pieces form a puzzle that may be different from what you thought it would be."

Meanwhile, CSI's Marg Helgenberger will play anthropologist Christine, a longtime Chester's Mill resident who is just beginning to emerge as an important figure in the dome's story.

"[She's a] new resident of Chester's Mill, and yet [she's] been there this whole time," Baer said. "That's the driving engine of this season: How is that even possible?"

Baer continued: "We've taken the viewers through all kinds of calamaties. But now, it's really character-oriented. We promise you we will answer why the dome is there, but of course we're going to ask more questions."

Schlattmann also said new viewers will be able to watch the two-hour season 3, episode 1 premiere without having seen previous seasons or episodes.

"It's a really good jumping-in point," he said. "We like what we did the first two seasons, and now we had to go further."