Stoned

S4, E7: Romantic relationships are in flux. Zoe (Jordan Hinson) is home for a visit and hints at a new heartthrob. Henry (Joe Morton) is courting his wife while Dr. Grant (James Callis) and Carter (Colin Ferguson) spar over Allison. Jo (Erica Cerra), on the other hand, is done with love for now and just wants to get her house rebuilt. But that project is on hold because hunky paleo-anthropologist Dr. Derek Thurgood (John Reardon) says he found ancient human remains at the site and refuses to allow the build to continue. His former student Zoe offers to help at the dig, causing Carter to wonder if her interest is anthropology or the anthropologist. Jo and her contractor, Tanya Zimmer (Stephanie Belding) just want the site cleared, now. How far would Zimmer go? Carter and Zoe are forced to consider the worst when they find Thurgood apparently encased in stone.