Under The Dome has made some additions to its cast for Season Two. CSI: NY's Eddie Cahill and Misfits' Karla Crome have been tapped to become series regulars in Chester's Mill in its sophomore season. Eddie Cahill will play Big Jim's brother-in-law, and Karla Crome will join the series as a teacher. Cahill was a series regular for all 197 episodes of CSI: NY, where he played Detective Don Flack. Crome, meanwhile, will make her U.S. TV debut.