Robin Masters' publisher buries a chest containing one million dollars on Oahu, and a contest is held to find it. Magnum is tasked with protecting the woman who has the clues to the chest's whereabouts.
- Tom Selleck as Thomas Sullivan Magnum IV
- John Hillerman as Jonathan Quayle Higgins III
- Roger E. Mosley as Theodore "T.C." Calvin
- Larry Manetti as Rick Wright
- Kwan Hi Lim as Lieutenant Yoshi Tanaka