Vicki (Jill Whelan) models the bridesmaid's gown she plans to wear for Julie's (Lauren Tewes) wedding, while Isaac (Ted Lange) finds a flaw in the wedding gift that he bought on the crew's behalf. Barbara (Michelle Phillips) feels jealous of Connie (Jenilee Harrison) and Ralph's (Patrick Duffy) relationship and sends him a love letter, which Connie intercepts. Having been captured by Deke (José Ferrer) and Milo (Harry Morgan), the Mongala (Patrick Ward) is caged below in the hull of the ship. When Milo finds out some new information about the Mongala, Vivian (Katherine Helmond) issues an ultimatum. Gopher (Fred Grandy) and Doc (Bernie Kopell) continue their pursuit of Julie's replacement, Yvonne (Delvene Delaney). While the crew members are in Sydney for the wedding, Julie and Tony give them a tour of the Rossmore Animal Preserve, where Tony is on staff.