Hawaii Five-0

CBS | 8:00 pm

When a lethal assassin starts targeting mob bosses on the island, a new ally steps up to assist McGarrett (Alex O’Loughlin) and his team in the Season 10 premiere, "Ua ‘eha Ka ‘ili I Ka Maka O Ka Ihe," which is Hawaiian for "The Skin Has Been Hurt By the Point of the Spear." On a more emotional note, the members of Five-0 bid goodbye to one of their own. Katrina Law ("Arrow") joins the cast; Rob Morrow guest stars.