Magnum's friend Kacy, an ex-surfboarding champion, is found dead on the beach and TM investigates to find the murderer.
Frustrated by the official police inquiry, Magnum must go against the tide and investigate the death of a champion surfer friend.
- 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
- W.K. Stratton as Police Officer Kelly
- John Calvin as Gary the Drug Dealer
- Wings Hauser as Nick Frangakis
- Vic Morrow as Police Sergeant Jordan
- Diane Crowley as Kacy the surfer
- James Grant Benton as Ralph the Bartender
- Patrick Bishop as Keoki
- Joey Coleman as Kid on the Beach
- Robert L. Silva as Police Jailer (credited as Robert Silva)
- As Magnum walks through the jungle looking for Nick, the camera brushes against a branch and causes it to move noticeably.
- After Kelly pulls his gun on Magnum, you can see the shadow of Vic Morrow getting into position for his part in the scene.