Linda Evans & Lee Majors played a couple on the cruise. They both starred in the 1960's tv show "The Big Valley". Linda Evans played Audra Barkley. The only daughter of Victoria &, the late, Thomas Barkley. Lee Majors played the illegitimate son of Thomas Barkley. The show ran for 4 seasons from 1965-1969.
In this episode, The Big Valley's Lee Majors and Linda Evans appear together in the storyline "Dear Roberta." Evans' Dynasty co-star John Forsythe also appears in a separate storyline.
Patricia Klous later joins the cast as Judy McCoy in season 8 of The Love Boat.