Pernell Roberts Trapper John McIntyre Actor Gregory Harrison Dr. George Alonzo 'Gonzo' Gates Actor Mary McCarty Clara 'Starch' Willoughby, R. N. Actor Christopher Norris Gloria 'Ripples' Brancusi, R.N. Actor Brian Stokes Mitchell Dr. Justin 'Jackpot' Jackson Actor Jessica Walter Melanie Townsend McIntyre Actor Charles Siebert Dr. Stanley Riverside II Actor Marion Yue Actor Monte Markham Guest Star Bill Adler Guest Star Maurice Hill Guest Star Gloria DelBianco Guest Star Marc Daniels Director Don Brinkley Writer