Meredith, Cristina and Bailey come to Lexie and Sadie’s rescue when a routine surgery goes horribly wrong, as Owen and Derek treat a man seriously injured while sleepwalking and Mark…

Dead Marine’s day job at a government think tank leads Gibbs and the team into the life of a 12-year-old prodigy who may be the killer’s next target.

Ben unwillingly divulges information to Locke about the island, taking him on a journey to various locations including strange monuments and the mysterious Jacob. Back at the beach, Juliet’s secret…