Dr. Marcus Welby, a general practitioner, and Steven Kiley, Welby's young assistant. The two try to treat people as individuals in an age of specialized medicine and indifferent physicians.Dr. Marcus Welby, a general practitioner, and Steven Kiley, Welby's young assistant. The two try to treat people as individuals in an age of specialized medicine and indifferent physicians.Dr. Marcus Welby, a general practitioner, and Steven Kiley, Welby's young assistant. The two try to treat people as individuals in an age of specialized medicine and indifferent physicians.