J.R. plots to frame Peter and teach Sue Ellen a lesson. Afton hates Vaughn Leland. J.R. wants a double wedding ceremony; Clayton marrying Ellie, and Bobby marrying Jenna. Katherine learns of Mark's medical problem. Peter turns Lucy down on a modelling assignment in the Caribbean. J.R. is nice to Peter to make him feel welcome. Peter teaches astronomy to little John Ross. Cliff borrows $227 million despite his controller's doubts about the loan contract. Bobby admits to Jenna Wade that he can be inflexible and self-centered. Bobby tells Jenna Pam's got a hold on him. Pam decides to marry Mark. J.R. and Vaughn Leland put on an act in front of a completely unsuspecting Cliff to make him sign the loan papers. J.R. promises Katherine Wentworth he'll give her the "blackmail tape" as soon as Pam and Mark get married. Bobby is absolutely stunned and devastated to learn of Pam's decision to marry Mark. Jessica Montford arrives from London and surprises J.R. with a special gift.