Season seven stars John Forsythe as millionaire oil magnate Blake Carrington; Linda Evans as his wife Krystle; Jack Coleman as Blake and Alexis's earnest son Steven; Gordon Thomson as Blake and Alexis's eldest son Adam; Heather Locklear as Krystle's niece and Steven's ex-wife Sammy Jo; Michael Nader as Alexis's husband Dex Dexter; Karen Cellini as Blake and Alexis's youngest daughter, Amanda; Diahann Carroll as Blake's half-sister Dominique Deveraux; Wayne Northrop as Blake's former chauffeur Michael Culhane; Ted McGinley as Clay Fallmont; and Joan Collins as Alexis Colby, Blake's ex-wife and the mother of Adam, Fallon, Steven, and Amanda.