'Under the Dome': Barbie & Angie Plot Against Jim

When Barbie (Mike Vogel) weighs some pretty heavy allegations against Big Jim (Dean Norris), Angie (Britt Robertson) is more than happy to side with Chester's Mill's most-wanted.

Related: Junior Abandons Angie on 'Under the Dome'

Click the video above for a sneak peek at the heart-pounding, penultimate conclusion of season one!

Watch an all-new Under the Dome on Monday, September 9 at 10 p.m. ET/PT on CBS.