Sue Ellen's mother, and predatory sister, Kristin, arrive at Southfork for a visit to see baby John Ross, much to Lucy's displeasure. Digger Barnes is back in Dallas visiting Cliff and Pam, but he's not well. He's diagnosed with a genetic disease which affects the whole family. Though they know that John Ross may be Cliff's son, he and Pam decide to keep the disease a secret. Meanwhile, J.R starts to take a closer look at Sue Ellen's baby sister...
Elenco: Larry Hagman , Patrick Duffy , Ken Kercheval , Howard Keel , George Kennedy , Kimberly Foster , Sheree J. Wilson , Sasha Mitchell , Barbara Stock , Cathy Podewell .