Among the barrage of pilot pickups this evening, CBS closed two casting deals for Under The Dome, its 13-episode summer series from Steven Spielberg and Stephen King. Natalie Martinez and Alex Koch have joined the show based on King’s bestselling 2009 novel. Under The Dome is set in Chester’s Mill, a small New England town suddenly and inexplicably sealed off from the rest of the world by an enormous transparent dome. The town’s inhabitants must deal with surviving the post-apocalyptic conditions while searching for answers to what this barrier is, where it came from and if and when it will go away. Martinez will play Linda, a young, ambitious deputy, fiercely loyal to Sheriff Duke Perkins, who runs a tight ship in the town of Chester’s Mill. Koch, repped by WME and One Entertainment, will play Junior Rennie, son of the local politician and car dealer, who is a smart, secretly deeply disturbed college freshman desperately in love with local girl Angie, a waitress who’s desperate to get out of Chester’s Mill. Martinez, repped by WME and Mosaic, stars in Broken City.