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