Donald P. Bellisario Creator, Executive Producer Glen A. Larson Creator, Executive Producer Tom Selleck Thomas Sullivan Magnum Actor John Hillerman Jonathan Quayle Higgins III Actor Roger E. Mosley T.C. Actor Larry Manetti Rick Actor Cassie Yates Betty Windom, Collette Guest Star David Spielberg Dan Morgan, Inspector Vittorio Mono Guest Star Oh Soon-tek Dr. Bill Su, Dr. Ling Guest Star Patrick Collins Russell Smythe, Hans Leopold Guest Star Jay Huguely Writer John Patterson Director