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This time, Tony Baretta (Robert Blake) goes undercover as a truck driver. Heading to the waterfront, Baretta searches for the person or persons who have been stealing valuable truck shipments. The key to the mystery may be in the hands of title character Barney, played by familiar character actor Robert Symonds. Also in the cast is Sheila Larken, best known to later viewers as the mother of FBI agent Scully on The X-Files, and veteran character actor Arthur Space, who played Robert Blake's father in the 1944 Laurel and Hardy comedy The Big Noise.