Pernell Roberts Trapper John McIntyre Actor Gregory Harrison Dr. George Alonzo 'Gonzo' Gates Actor Charles Siebert Dr. Stanley Riverside II Actor, Director Madge Sinclair Ernestine Shoop, R. N. Actor Brian Stokes Mitchell Dr. Justin 'Jackpot' Jackson Actor Timothy Busfield Dr. John 'J.T.' McIntyre Actor Janis Paige Catherine Hackett Actor Lorna Luft Nurse Libby Kegler Actor Chris Hutson Nurse Actor Beau Gravitte Dr. Andy Pagano Actor Kip Gilman Actor Sarah Cunningham Nurse Andrews Actor Andrea Marcovicci Fran Brennan Gates Actor Roy Stuart Guest Star Lisa Nelson Guest Star Betty Karlen Guest Star Jonathan Goldsmith Guest Star Julie Inouye Guest Star Evelyn Guerro Guest Star J.D. Hinton Guest Star Michael Caffey Director Leo Penn Director Victor Lobl Director Howard Morris Director Charles S. Dubin Director Doug Wise Director John Whelpley Writer Kimmer Ringwald Writer Gene O'Neill Writer Deborah Zoe Dawson Writer Nancy Bond Writer Barry Pollack Writer Robert Malcolm Young Writer Carl Sautter Writer John Breckfield Writer Victoria Johns Writer Noreen Tobin Writer Robert C. Thompson Writer Debra Frank Writer