After a twenty-year absence, Blake receives a visit from Jason Colby. Jason proposes the two tycoons build a joint pipeline. Although reluctant to do business with Colby because of his past shady dealings, Blake needs Jason's tankers to move his oil out of China. Jason confides to his sister Constance that he is dying. Jeff is surprised to hear from his aunt Constance, who insists it is urgent he come to California. Psychic Justin Dehner helps in the search for Fallon, who remains in California with Miles. Dex is furious with Alexis's growing obsession with Galen. Michael shuts Amanda out of his life. Gordon Barrett, assistant undersecretary of state, questions Blake about the revolution in Moldavia. In New York, Joel and Sammy Jo convince Rita to undergo plastic surgery to complete her transformation into Krystle's double.

Jason imposes a one-week deadline for Blake to decide on the pipeline proposition. Claudia heads to San Francisco to think about her relationship with Adam. Alexis turns to both Blake and Jason for help in rescuing King Galen. While riding with Miles, Fallon is surprised to learn she is an excellent horsewoman. Under the guise of a business trip, Adam tracks down Claudia for a romantic reunion in San Francisco. In Los Angeles, Constance Colby stuns Jeff--and enrages Jason--by awarding her nephew 50% of Colby Enterprises, worth over $500 million. When Krystle makes a surprise visit to Sammy Jo's apartment, Rita, who now appears to be Krystle's double following plastic surgery, hides in the bedroom. Jonathan Lake of the State Department tells Dominique they've met before--when she saved his life in Paris.

As Blake becomes increasingly disturbed by Krystle's sexual resistance, Joel tells Rita that she has to sleep with Blake. In the meantime, Joel takes the real Krystle out for a night-on-the-town, where they are seen by an astonished Alexis and Dex. Krystle's signals for help are ignored. With Alexis' financial backing, Galen prepares to send Michael to New York to hire mercenaries for their cause. Determined to reclaim the oil well, Claudia attempts to win over Steven, believing he can persuade Blake to relinquish control. Adam Carrington offers Bart Fallmont a handsome bribe to prevent a preliminary injunction against the family enterprise.

In order to appease Blake, Rita, posing as Krystle, agrees to see a psychiatrist. But when her evasive behavior continues, Blake threatens divorce. Rita is forced to poison her unsuspecting husband in a frantic effort to safeguard Joel's plan. Alexis visits the still crippled Galen. After she leaves, Galen reveals his secret recovery. Amanda relives the nightmare of the wedding massacre and believes it to be an omen of Michael's impending fate when there is no word from him. Jonathan and Dominique's romantic involvement deepens, but when Jonathan announces his new association with Bart Fallmont, she severs further relations. Dominique is now left vulnerable to Garrett's attempts to rekindle an old flame.

Blake suffers dizzy spells as Rita's slow poisoning takes effect. Anxious to secure the Carrington estate, Joel convinces Rita to administer the fatal dose. Joel professes his love to Krystle, who insincerely returns his affections in an attempt to win her freedom. When this fails, she desperately feigns illness in a second ploy to escape. An enraged Steven engages Bart Fallmont in hand-to-hand combat over the pipeline construction. Dex is granted full building rights. Claudia hastens to Oklahoma to fight for her oil well, leaving a bewildered Adam behind. Alexis receives a mysterious phone call from Caracas, where her imprisoned sister, Caress Morell, is set free in exchange for the ""Alexis Carrington-Dexter Story"". Sammy Jo discovers the empty vial of poison, and confronting an alarmed Rita, begins to suspect Joel's deadly plan.

Galen plots to regain his throne while Elena, learning the counter-revolution is in jeopardy, solicits Michael's help. A mysterious woman visits Denver to conduct extensive research on Colbyco. Carress Morell, a journalist, is Alexis' sister. Alexis, noting Blake's loss of faculties, is ready to pounce. Adam forces Blake to grant him power of attorney. Adam boasts to Claudia, but she is suspicious, and continues her attempt to prove rightful ownership of the oil well. Sammy Jo learns that Joel and Rita plan to poison Blake and flee to South America with Krystle. After much soul searching, Sammy Jo warns Steven, but it may be too late. Steven arrives at the mansion just as Blake, stricken with an apparent heart attack, falls down the stairs.