Hawaii Five-0 returns for Season 7 on Friday, Sept. 23, at 9pm ET/PT on CBS with the season premiere episode “Makaukau ‘oe e Pa’ani? (Ready to Play?).” When the bodies of two serial killers are found on Five-0 property with chess pieces in their mouths, McGarrett (Alex O’Loughlin) and the team hunt for a vigilante as fear grows that tourists aren’t safe in Hawaii. Rosalind Chao guest-stars as Governor Keiko Mahoe. Other returning cast members include Scott Caan, Daniel Dae Kim, Grace Park, Masi Oka, Chi McBride and Jorge Garcia.