S13, E24: Cally and James are driven to vow revenge against the man they both vehemently hate -- J.R. Ewing. Aware that it was his sister Jessica who was trying to murder him, Clayton is further floored when she reveals shocking news about Dusty. Meanwhile, a suspicious Stephanie confronts J.R. about his intimate knowledge of her and McKay attempts to woo Clayton Farlow on to the Weststar Oil team.