The Substitute

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Dr. Christian is a radio medical drama series with Jean Hersholt in the title role. It aired on the Columbia Broadcasting System from November 7, 1937, to January 6, 1954. Two years after the conclusion of the long-running radio program, the series was adapted for television on 1956 where it aired in syndication also through CBS on the Ziv Television production company until 1957, with a younger "Dr. Mark Christian" portrayed by Macdonald Carey as Dr. Paul's nephew.

Wikipedia. CC BY-SA 4.0. Updated Mar 29, 2026.