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Friday (Jack Webb) and Smith (Ben Alexander) are on the lookout for a hit-and-run driver. Their detective work includes a thorough inspection of the fenders of the suspects' cars. In the end, however, the case is solved with a small print--not a fingerprint, but a lip print! Like most Dragnet episodes of this era, "The Big Lip" proves to be a good workout for several members of the Jack Webb Stock Company, including Vic Perrin and Olan Soule. Also on hand is former "Dead End Kid"Bobby Jordan, here billed more formally as "Robert."