A new ally helps McGarrett and the team when mob bosses on the island are targeted by an assassin; the team says goodbye to one of its own.

Cast: Alex O'Loughlin, Scott Caan, Meaghan Rath, Jorge Garcia, Beulah Koale, Katrina Law, Taylor Wily, Dennis Chun, Kimee Balmilero, Chi McBride, Richard Concepcion, Ian Anthony Dale, Eddie J. Fernandez, Tony Flores, Johnathan Gregory