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