Identical twins pretend to be one person in order to take the cruise on one fare. They leave Doc completely bewildered. Julie gets re-acquainted with an ex-lover, who claims to have broken things off with his wife. After suffering a series of accidents, the crew comes to believe that an elderly couple--which survived the Titanic--is cursed.

A woman who believes her departed dad was a noble sea captain forms an attachment for a devilish old purser; a newlywed couple are prevented by dislocated backs, sunburn and even poison ivy from enjoying their honeymoon; the crew upgrades a couple with modest means to a luxurious suite without consulting Capt. Stubing, forcing the couple to pose as wealthy socialites.

Isaac's possessive mother becomes jealous of her son's lady friend, while he objects to his mom sharing a cabin with her latest boyfriend; a divorced comedy team is too busy making jokes to admit they miss each other; Gopher's budding romance is nearly foiled by a jewel-stealing monkey.

A couple takes their son on a cruise in an attempt to end his relationship with an unsuitable girl; a May-December couple rethink their romance; an ex-showgirl's glamorous past jeopardizes her new career as a registered nurse.