Originally Aired: September 25, 1960

Gunsmoke #442, "Doc Judge," finds Doc Adams in a dangerous case of mistaken identity. When a bitter ex-convict named Bryce Hart arrives in Dodge City, he immediately confronts Doc at Delmonico's restaurant, insisting that Doc is actually Judge Kennebre from Wyoming—the man who sentenced him to seven years in prison. Despite Doc and Chester's protests that he's a physician, not a judge, Hart refuses to believe them and vows to kill Doc for revenge. Initially, Doc dismisses Hart as harmless, especially since the man isn't even wearing a gun. However, Chester grows increasingly concerned about the threat.

The situation takes a deadly turn when Chester witnesses Hart in action at the Long Branch Saloon. Armed now with a gun and demonstrating professional skill with it, Hart violently runs Bob Forrest out of the establishment, proving he's far more dangerous than Doc believed. With Marshal Matt Dillon out of town on business and not expected back for another day, Chester races to Doc's office to warn him of the escalating danger. The deputy must now find a way to protect Doc from a vengeful killer who won't listen to reason.