Bobby returns from South America with evidence regarding Wes Parmalee but it's an unexpected, and uninvited, guest at the annual Ewing barbecue who provides Miss Ellie with the shocking truth. J.R. and Clayton grow closer as a result of the Parmalee calamity. Donna has a brief but intriguing meeting with an important senator in her efforts for the oil lobby and J.R. and Cliff strike further sparks at the barbecue.