Guest Stars Anthony Andrews as Tony Selkirk Patrick Duffy as Ralph Sutton Harry Morgan as Professor Milo Endler Michelle Phillips as Barbara Carroll José Ferrer as Deke Donner Katherine Helmond as Vivian Endler 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