Robert Young

as Marcus Welby

James Brolin

as Steven Kiley

Anne Baxter

as Myra Sherwood

Susan Strasberg

as Tina Sawyer

Lew Ayres

as Dr. Andrew Swanson

Tom Bosley

as Tiny Baker

Pete Duel

as Lew Sawyer

Sheila Larken

as Sandy Welby

Mercer Harris

as Ray Wells

Penny Santon

as Consuelo Guadalupe-Lopez

Richard Loo

as Kenji Yamashita

Larry Linville

Ben Wright

Ron Stokes

Allison McKay

Craig Littler

Sheila Rogers

Fran Ryan