In this compelling episode of Gunsmoke, a traveling salesman named Professor Lute Bone comes to Dodge City, offering his "Wormseed Tonic," which claims to cure everything from rheumatism to indigestion. However, Marshal Matt Dillon soon discovers that the tonic contains opium, causing chaos as citizens begin to rely on the dangerous substance. Things escalate when a local man accuses the professor of killing his father after he took the tonic, leading Dillon and Doc Adams to confront the fraudulent healer before his dubious product causes any more harm.

The episode delves into themes of deceit, the exploitation of vulnerable people, and the consequences of quackery in the Old West. The tension rises as Dillon must determine how to handle the smooth-talking professor before the entire town falls victim to his false promises.

This script was reused in the television version of Gunsmoke on January 7, 1956, and again on the radio series on November 14, 1953.

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