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 Brandon Call Karen's Son Billy Guest Star Julie Cobb Magnum's Cousin Karen Guest Star Elisha Cook Jr. Francis 'Ice Pick' Hofstetler Guest Star Phyllis Davis Cleo Mitchell Guest Star Chris Abbott Writer Stephen A. Miller Writer Burt Brinckerhoff Director