TV Big Jim's Startling Revelation on 'Under the Dome' By ETonline Staff 4:00 PM PDT, September 13, 2013 Under the Dome is wrapping up its first season with a nail-biting cliffhanger next week, and we have a sneak peek!RELATED: Most Promising New Fall TV Shows In the clip, James "Big Jim" Rennie (Dean Norris) makes an unsettling revelation to his son Junior (Alexander Koch)."You want the truth? I have taken lives, but none that didn't absolutely need to be taken for the good of this town," says Big Jim, who is hell-bent on putting an end to Barbie (Mike Vogel). "You and I are in this together," Big Jim continues. "We were chosen."The Under the Dome season one finale airs Monday, September 16 at 10 p.m. on CBS.