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British criminologist Dr. Avatar (Philip Coolidge) is a staunch advocate of phrenology, a once-popular (and long discredited) theory which states that a man's criminal tendencies can be determined by the bumps on his head. Hiring Paladin (Richard Boone) as his guide, Avatar is determined to prove his theory by studying the noggin of an elderly, reclusive gunfighter named Jake Trueblood (Roy Barcroft)--who is understandably disinclined to be anyone's guinea pig! This episode was originally scheduled to air on December 30, 1962.