S1, E1: Following the personal and professional lives of the heavy-water lifeguards who patrol and protect the North Shore of O’ahu, Captain Harlan “Sonny” Jennings (Robbie Magasiva) and his core team of lifeguards —lieutenant Em Wright (Arielle Kebbel), and veteran lifeguards Will Ready (Adam Demos) and Laka Hanohano (Kekoa Kekumano) monitor the most famous and dangerous stretch of coastline in the world. In the series premiere episode two rookie lifeguards, Hina Alexander (Zoe Cipres) and Kainalu Emerson (Alex Aiono) try out for a position on the team, as Sonny and his family are still grieving the loss of his nephew Zion and a romantic past is revealed between Em and a now engaged Will.