Seeking revenge, Tommy McKay plants an explosive device in the unsuspecting Bobby's briefcase. At her sister April's expense, Michelle connives her way into Cliff's heart.
Having gone behind brother Bobby's back in stretching Ewing Oil's reserves too thin, J.R. frantically scrambles to secure enough oil to meet a potentially deadly deadline.
Tommy claims he's changed, while plotting revenge against Bobby; a gallery owner likes Cally's paintings; J.R. makes a risky deal behind Bobby's back; Cliff finally finds Afton.
A raging J.R. Ewing is consumed with vengeance after Sue Ellen blackmails him with her threatening motion picture.
Someone is attempting to frighten April as she continues to see Bobby while Sue Ellen gives Cally advice on how she will have to fight to make her marriage work. J.R. gets threatened by Sue Ellen about her movie being released if he ever crosses her again.
America's most infamous capitalis, J.R. Ewing, travels to Moscow, the mecca of Communism. At Vanessa's urging J.R. and Bobby flee Vienna for a crucial and mysterious meeting in Red Square. Meanwhile, back at the Ranch, Sue Ellen has second thoughts about her relationship with Don after a scene is filmed between the actors playing Sue Ellen and J.R. in her movie.
In the romantic city of Vienna, Vanessa Beaumont, the only woman to ever break J.R. Ewing's heart, forces him to choose between her and his love for Cally. McKay suggests to April that she dissuade Bobby from pursuing the European oil contract while in Dallas, Cliff obsesses over finding out it if Afton's daughter is his own.
The Ewings head off to Vienna in their battle for the coveted European oil contract. Bobby and April explore their blossoming relationship atop the famed Maria's Mountain in Salzburg. Meanwhile, back at the ranch, Clayton still can't retain his memory.
Honeymooners J.R. and Cally, along with Bobby, mix pleasure with oil business in the spectacular old town of Salzburg, Austria, until Bobby is shocked by a surprise visitor. The Ewing brothers battle Carter McKay for a multi-billion dollar European oil contract, while Afton Cooper dismisses Cliff's interest in her personal life.
Bobby's love affair with Tracey is shattered when Carter McKay vows to avenge the thrashing his beloved son, Tommy, suffered at the hands of Bobby. Meanwhile, Sue Ellen feels insecure in her relationship with Lockwood after seeing her life story exposed on film and J.R. and Cally show an interested European oil investor a good time -- Texas style.
The Ewing brothers are back in business together and set their sights on the biggest oil deal in history at the expense of Carter McKay and Weststar. April comes between Bobby and Tracey after she tries to convince Tracey that her brother is dangerous. Sue Ellen and Don Lockwood travel to a romantic Malibu beach to cast their film. Cally attempts to make herself more acceptable to Dallas standards and readily agrees to help J.R. with his business dealings.
The 300th episode marks an unusual show in which the feuding Ewing brothers, J.R. and Bobby, get trapped overnight in an elevator, with a defiant Bobby owning the only source of food or drink -- a precious case of expensive wine. The unique situation pits the pair against each other in a battle of wills and wits, not only sparring over how to run Ewing Oil, but how to run their respective lives as well.
J.R., hoping to get back into Ewing Oil, seeks information on Weststar's dealings while Sue Ellen keeps seeing Don Lockwood and Bobby and Tracey's relationship continues to take a downward turn.
It's brotherly war when Bobby furiously confronts J.R. for ignoring their agreement to consult one another concerning business. Sue Ellen, drawing closer to Lockwood, searches for clues into his past while Tommy McKay pursues the drug trade in Dallas under the guise of entering the import/export business. J.R. becomes aware that Tommy not only has eyes for April but also hates his father -- Carter McKay.
A tornado threatens the wedding ceremony while Carter McKay learns that his son Tommy hasn't fully recovered from his involvement with drugs, while Tommy sets his sights on the beautiful and wealthy April. Bobby's relationship with Tracey suffers when she shoulders the tension between her brother and father.
Against an ominous skyline of black storm clouds, Southfork prepares for another one of its all out, glamorous weddings. Cally shocks J.R. with information that will change his life forever and Sue Ellen bares her soul to Lockwood when she provides him with her personal diaries.
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