Pernell Roberts Trapper John McIntyre Actor Gregory Harrison Dr. George Alonzo 'Gonzo' Gates Actor Christopher Norris Gloria 'Ripples' Brancusi, R.N. Actor Charles Siebert Dr. Stanley Riverside II Actor Brian Stokes Mitchell Dr. Justin 'Jackpot' Jackson Actor Simon Scott Arnold Slocum Actor Madge Sinclair Ernestine Shoop, R. N. Actor Richard Schaal Dr. David Sandler Actor Michael Tucci Dr. Charlie Nichols Actor Chris Hutson Nurse Actor Sarah Cunningham Nurse Andrews Actor Timothy Busfield Dr. John 'J.T.' McIntyre Actor Mary McCarty Clara 'Starch' Willoughby, R. N. Actor Marcia Rodd E.J. Riverside Actor Jessica Walter Melanie Townsend McIntyre Actor Lorna Luft Nurse Libby Kegler Actor Beau Gravitte Dr. Andy Pagano Actor Andrea Marcovicci Fran Brennan Gates Actor Robin Ignico Andrea Actor Bebe Kelly Nurse Clover Actor Janis Paige Catherine Hackett Actor