The Hawaii Five-0 and Magnum P.I. crossover is a two-part crossover event between Hawaii Five-0 and Magnum P.I. that aired on CBS. The event aired on January 3, 2020, with the Hawaii Five-0 episode "Ihea 'oe i ka wa a ka ua e loku ana?" which is Hawaiian for "Where were you when the rain was pouring?", followed by the Magnum P.I. episode "Desperate Measures". Jay Hernandez, Perdita Weeks, Zachary Knighton, Stephen Hill, Meaghan Rath, Katrina Law, and Beulah Koale appeared in both parts of the event as Thomas Magnum, Juliet Higgins, Orville "Rick" Wright, Theodore "TC" Calvin, Tani Rey, Quinn Liu, and Junior Reigns, respectively (Melissa Tang also guest starred in both parts as Erin Hong).