Dynasty - Season 5 Episode 11 : Swept Away 1989

Upon learning that he may be Amanda's father, Blake resolves to ask Amanda to take a blood test. Nicole tells Jeff there's a chance Peter DeVilbis may have been with another woman at the time of the crash. Under the pretense of a family outing, Alexis arranges to send Dex and Amanda to a ski lodge. With the tension growing between them, Amanda and Dex begin to fight. Their fury, however, soon turns to passion. Alexis finally arrives and announces the three are bound for London, where she and Dex will marry.