The pilot film for the long-run series introduced the kindly small-town general practitioner who, following a mild coronary, grudgingly brings in an independent, motorcycling young associate to help share his workload. Welby's lady friend and his family, part of the plot of this movie, were written out of the subsequent series, with only his medical sidekick, Steven Kiley, and their secretary/nurse, Consuelo, remaining as regulars.

Robert Young
Marcus Welby

James Brolin
Steven Kiley

Anne Baxter
Myra Sherwood

Susan Strasberg
Tina Sawyer

Lew Ayres
Dr. Andrew Swanson

Tom Bosley
Tiny Baker

Pete Duel
Lew Sawyer

Sheila Larken
Sandy Welby
Mercer Harris
Ray Wells
Penny Santon
Consuelo Guadalupe-Lopez

Richard Loo
Kenji Yamashita

Larry Linville
Monopoly
Monopoly

The Ghost Writer
The Ghost Writer

The Blue Knight
The Blue Knight

Big House Blues
Big House Blues

Beetle Bailey
Beetle Bailey

Chase
Chase

Dogville: The Pilot
Dogville: The Pilot

House on Greenapple Road
House on Greenapple Road

Kate McShane
Kate McShane

Carrie
Carrie

My Freaky Family: Welcome to My World
My Freaky Family: Welcome to My World

Psykopat
Psykopat