Vanessa reassures J.R. that James is really his son. James' appearance puts a strain on Cally and J.R.'s marriage. Cally accuses Vanessa of plotting to take J.R. away from her. A tanker collision involving Ewing Oil and Weststar puts the two companies on opposite sides again, as a black tide of oil is heading toward the Texas coast. Tension rises between J.R. and Bobby when Bobby finds out about the Ewing tanker. Cliff leaves Ewing Oil, takes McKay's side, and forms a committee to investigate the tanker disaster. Michelle threatens J.R. because in her view, he didn't keep his word after she got Cliff out of Ewing Oil. Vanessa unsuccessfully tries to talk James into going to Europe with her. Vanessa leaves for Europe and James moves into Southfork.