Mark insists on a big wedding. Katherine tells an unaware Bobby of J.R's "blackmail tape" and Bobby has a showdown with her. J.R. keeps digging into Clayton's past and his wife Amy's death in San Angelo years ago. Bobby confronts J.R. about Katherine and the tape. J.R. pressures Bobby to marry Jenna Wade. Peter is in jail and he asks Sue Ellen for help in posting bail. Mark learns the truth about his health. Jenna accepts Bobby's marriage proposal. J.R. puts on an act in front of Peter and Sue Ellen. Cliff admits to Pam that he's financially ruined. Pam is devastated to learn of tragedy strking Mark.