When the Dobermans dig up what appears to be a human bone, Magnum and Higgins help Katsumoto investigate the murder of his former mentor.
- Roger E. Mosley guest stars as Booky. He was the original TC from the 80s Magnum PI series.
- Jay Hernandez as Thomas Magnum
- Perdita Weeks as Juliet Higgins
- Zachary Knighton as Orville "Rick" Wright
- Stephen Hill as Theodore "T.C." Calvin
- Tim Kang as Detective Gordon Katsumoto
- Amy Hill as Teuila Tuileta
- Roger E. Mosley as John Booky
- Heather Mazur as Gina Pryor
- Fatema Merchant, MD as Dr. A. Lee
- Susan Park as Henny Tak
- Patrick Gallagher as Lieutenant Roger Akan
- Taiana Tully as Detective Palea
- Cindy Ramirez as Julia Kemp
- Adrienne Wilson as Kelsey
- Jacob I. Titus as Justin "J.T." Kalua
- Deniz Akdeniz as Mike Trevino Jr.
- Michael Rose as Mike Sr.
- Garret T. Sato as Eddie Harada
- Nick La'a as Katsumoto's Son
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