S6, E24: J.R. finds the Ewing name doesn't mean much in Cuba when he arrives there to negotiate his and Holly's oil shipments. While J.R. is away, Sue Ellen confronts Holly to disprove his infidelity and Mickey's mother visits Southfork at Donna and Ray's invitation. Bobby and Cliff accidentally meet and have a confrontation about the Canadian deal as well as Bobby's troubled marriage. Miss Ellie and Clayton are the subjects of much speculation.