David Victor Creator, Executive Producer Robert Young Dr. Marcus Welby Actor James Brolin Dr. Steven Kiley Actor Elena Verdugo Consuelo Lopez Actor Anne Baxter Actor Sharon Gless Actor Anne Schedeen Actor Gavin Brendan Actor Pamela Hensley Actor Susan Howard Greta Francis Guest Star Jan-Michael Vincent Ritchie Manning Guest Star Patrick O'Neal Dr. Valentine Peterson Guest Star Susan Clark Judy Graham Guest Star Dana Elcar Dr. Tomlinson Guest Star Lyle Waggoner Eric Lundgren Guest Star Jackie Coogan Vince Darrell Guest Star Kristina Holland Jan Michaels Guest Star Cathleen Cordell Mrs. Baxter Guest Star Ann Doran Mother Marie Therese Guest Star Clay O'Brien Peter Graham Guest Star Dan Ferrone Dr. Carter Guest Star Peter S. Fischer Writer Paul Schneider Writer Dick Nelson Writer Jerry De Bono Writer Robert Malcolm Young Writer Joanna Lee Writer Bess Boyle Writer Edward DeBlasio Writer Jerome Ross Writer Leo Penn Director Marc Daniels Director Joseph Pevney Director Margaret Schneider Writer Philip Leacock Director Earl Bellamy Director Hollingsworth Morse Director Herschel Daugherty Director Harry Falk Director