Season 13

Following the showdown in Europe, Ewing Oil and Weststar begin a new battle. Cliff is preoccupied at work. April's sister, Michelle, shows up in Dallas. Tommy returns home and attempts to make amends. Miss Ellie starts a search to find what the key in Jock's card opens.

Tommy claims to be a changed man as he plots revenge against Bobby. Cally's paintings manage to impress a gallery owner. J.R. makes a risky deal without Bobby's knowledge. Cliff manages to locate Afton. The mysterious key sends Miss Ellie and Clayton to New England. J.R. meets April's sister.

J.R. thinks about agreeing to a risky deal on a tanker when he needs oil badly. Cally has trouble getting past the fact that April once slept with her husband. Michelle meets Cliff in secret. Miss Ellie and Clayton's treasure hunt takes them to the town where Jock first struck oil. Tommy's violent temper gets out of control again.

Tommy ends up planting a bomb in Bobby's briefcase in an effort to protect his father against some perceived threats. J.R. comes to a decision about the tanker deal. Cally's art causes further interest. Cliff feels left out of the loop at Ewing Oil. Miss Ellie and Clayton make their way to Pride in Texas.

The tanker that J.R. has purchased is threatened by a Gulf storm. Michelle continues to try and get closer to Cliff. Cally's patron ends up helping her out further. Carter and Tommy are involved in a fatal encounter. J.R. receives a surprise visitor at Ewing Oil.

J.R. introduces James to the social scene in Dallas. Miss Ellie and Clayton look around Pride for clues about the key. Christopher goes out on his first date. April wants a commitment from Bobby. Vanessa returns to Dallas.

J.R. and Cally welcome Vanessa at Southfork. Miss Ellie and Clayton meet Sarah Ewing and find out about Jock's past in World War II when he helped others. Carter receives some bad news about an oil tanker. James ends up making a shocking claim about his true parentage to the Ewings at the Oil Baron's Club.

The Ewing family are shocked by the news that James is J.R.'s son. A tanker crash creates a P.R. nightmare for both Ewing Oil and Weststar. Michelle attempts to squeeze both Carter and J.R. Vanessa attempts to convince her son to return to Europe.

J.R. begins to mould James, who seems to already have the seduction line done to perfection. Cliff wants to be part of the official investigation into the tanker accident. John Ross is surprised to have a new half-brother. Bobby wants to commit to April. Miss Ellie gives J.R. the letter that Jock wrote.

Carter hopes that he can use the tanker accident to help bring down Ewing Oil. Jock's letter manages to inspire J.R. Bobby receives a surprise visit from Kay. Cally believes that J.R. is sleeping with Michelle. Christopher and John Ross argue about James.

Cally thinks that Michelle is lying about her affair with J.R. and she ends up confessing about an affair of her own. Kay attempts to help Bobby to deal with the tanker situation which manages to upset April. J.R. seduces an investigative committee member. James manages to show impressive business acumen.

J.R. and Cally manage to repair their relationship. Carter traps Cliff in a sexual blackmail plot. James disapproves of his father's business tactics. Kay wants to know what Bobby's intentions are towards April. Bobby sells Ewing Oil assets to pay for the oil clean-up.

J.R.'s attitude about his affairs makes his son realize that sex is a much bigger part of the oil business than he thought. Cally is looking forward to her art show at Lucy's gallery. Michelle finds out about Carter's treachery against Cliff. Bobby and April make wedding plans.

J.R. feels guilty, believing the end of Ewing Oil is close. Cliff feels torn between doing what's right and his hatred of the Ewing family. Carter's wife is fed up with his constant mistreatment of her.

Cliff meets P.R. guru Stephanie Rogers, who tells him that she can make his political dreams a reality. J.R., Cally, and John Ross travel to Pride to help Miss Ellie. Bobby gives April an engagement ring but they fight after. James and Michelle come to terms.

Bobby follows a woman who he believes could be Pam. J.R. meets Blackie Callahan, an old friend of Jock's. April is depressed over her and Bobby's argument. Cliff is suspicious of Stephanie's motives.

Bobby's obsession with the Pam look-a-like ends up damaging his relationship with April. Blackie helps to drill for oil in Pride. James meets Duke and Melinda Carlisle.

Carter manages to solve Michelle's problem with Eugene Inagaki. Bobby is unable to stop thinking about Jeanne. Cally and Michelle clash. J.R. gives James a tough business lesson. Stephanie has Cliff prepare to run for office. Miss Ellie and Clayton go to the reading of Atticus Ward's will.

April leaves Dallas in an effort to get over Bobby. J.R. reconnects with Serena. Cally ends up turning to James for support. Cliff manages to get a major political appointment.

James and Michelle have to deal with delays in getting their club up and running and they end up turning to Carter for help. J.R. looks into Stephanie's past and promises Cally he'll be a better husband. Bobby attempts to get April to agree to return to Dallas.

Cally is determined to make her marriage work. April's mother helps her decide on Bobby. Miss Ellie and Clayton investigate their friends' murders. J.R. manages to get some information on Stephanie. James and Michelle fall out. Bobby plans a trip with his son.

April gives up her business interests to focus on her wedding preparations. Clayton discovers that he's next in line to inherit Atticus' estate. J.R. pushes Cally to a breaking point in their marriage.

J.R. starts a plan to ruin Cliff and drive Michelle out of town. Miss Ellie and Clayton find out that Jessica Montfort could be involved in the dealings surrounding Atticus Ward's will. Michelle and James continue to be at odds. Bobby decides who the best man will be at his wedding.

Jessica ends up making a shocking confession. Furious with J.R.'s continued mistreatment and disrespect, Cally and James come up with a plan. Stephanie ends Cliff's political career aspirations after they fall out.

It is the day of Bobby and April's wedding. Cally feels conflicted about her plan for revenge against J.R. after she discovers that she is going to have a baby. J.R. plots to gain control of Jessica's voting rights in Weststar. Cliff meets Liz Adams. Miss Ellie and Clayton leave for an extended Asian vacation.

J.R. finds that getting to Jessica inside the sanitarium isn't as easy as he thought it would be. Liz recognises Carter McKay from her past. James and Cally talk to a divorce lawyer.

J.R. manages to get Jessica to sign over her Weststar voting rights. Cliff attempts to convince Liz not to leave Dallas. Liz and McKay manage to reach a mutual understanding about keeping quiet about the past that they shared. Cally and James manage to get their revenge against J.R.