Guest Stars Anthony Andrews as Tony Selkirk Michelle Phillips as Barbara Carroll Harry Morgan as Professor Milo Endler Katherine Helmond as Vivian Endler Patrick Duffy as Ralph Sutton José Ferrer as Deke Donner Donna Dixon as Jill Gary Frank as Dr. Barry Mason Jenilee Harrison as Connie Wilker Patrick Ward as Mongala Delvene Delaney as Cruise Director Yvonne Petty Co Starring Brendan Lunney as David Selkirk Queenie Ashton as Mrs. Selkirk