The final entry into the series finds the recruits in an exuberant mood after chipping in to buy a used 1963 Chevy convertible. When they can't get it to run, Sharkey finds a list of things wrong, as it begins to self-destruct. Sharkey decides to help them get their $250 back from Honest Ernest (familiar character actor Alan Oppenheimer), after they take the car back to him and are only given $50. Sharkey goes to the used car dealership with Pruitt who is to operate a hidden tape recorder to gather Honest Ernest's verbal guarantee. When they get back to base they find it only recorded Pruitt's heartbeat. Robinson next gets the idea to pose as a special investigator from the Treasury Department suspecting the convertible has $50,000 of uncut diamonds stashed in one of the hubcaps. When he questions Honest Ernest, the used car dealer now works hard to get the car back. What follows is a comical set of twists and turns.
Some of the best one-liners and insults in what is really, IMO, one of the better episodes of the series.