The captain's ex-girlfriend comes aboard the ship and constantly makes passes at him because she feels neglected by her husband. A model pretends to be married to keep away annoying suitors. A man is convinced that a fellow passenger is an alien who turns into a plant every night.

A couple takes a cruise to celebrate its 40th anniversary, but considers breaking up after the husband learns that his wife secretly invested money in the stock market for years. They are now wealthy, but he is furious because he could have retired much sooner. A woman tries to get her husband's attention by claiming that Doc made a pass at her during an examination. A man sneaks on the cruise because he doesn't believe the man travelling with his girlfriend is her brother. He convinces the passenger in the cabin next to theirs to let him stay by claiming to be with the CIA.

The Virgin Islands serve as a backdrop for the Grand Prix Wine-Tasting Competition, whose winner receives a $25,000 prize.

Julie books Hank to entertain, but he moonlights as a stripper. Isaac tries to set up sad Frank with girls until his ex-wife Jan arrives. Merrill recognizes passenger Jim as a jewel thief and suspects him when a diamond is stolen.

Adam introduces his fifth wife Tania to the crew. Safety inspector Sid takes his job too seriously and sees danger everywhere. Financial group president Ralph tries to talk VP Lydia out of quitting due to bogus rumors about their affair.