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 Kay Lenz Sally DeForest Guest Star Hermione Baddeley Bernice Guest Star Christopher Mitchum Eric DeForrest Guest Star Gillian Dobb Agatha Chumley Guest Star Robert Hamilton Writer