The Expedition/Julie's Wedding/The Mongala/Julie's Replacement/The Three R's/The Professor's Wife: Part 1

Julie (Lauren Tewes) prepares to marry her fiancé Tony Selkirk (Anthony Andrews) during a stopover in Sydney, Australia. She asks Vicki (Jill Whelan) to be her bridesmaid; Doc (Bernie Kopell), Gopher (Fred Grandy) and Isaac (Ted Lange) to be her ushers; and Captain Stubing (Gavin MacLeod) to give her away. Award-winning anthropologist Milo Endler (Harry Morgan) and Vivian (Katherine Helmond), his wife of fifteen years, are on their way to a dig in the South Pacific. Milo's disgraced colleague Deke Donner (José Ferrer) once embezzled a university's money to bet on the horses at the racetrack. In the South Pacific, Deke plans to present Milo with what could be the find of the century: a Mongala (Patrick Ward), a missing evolutionary link between animals and humans. But Milo is so busy with his work that he neglects frustrated Vivian, who takes a liking to Captain Stubing. New Zealand rancher Ralph Sutton (Patrick Duffy) has a secret that he won't share with English teacher and fellow passenger Barbara Carroll (Michelle Phillips), while young beauty Connie Wilker (Jenilee Harrison) has eyes for him. Gopher and Doc both compete for the affections of new cruise director Yvonne Petty (Delvene Delaney).