Where's a Harpoon When You Need One?

Cybill gets a job as a spokeswoman on a cruise ship, but when she and Maryann take a cruise, it turns out to be one of displeasure: Dr. Dick, relentless in his efforts to win back Maryann, puts Cybill in a difficult situation by giving her a letter for his ex that Cybill knows will make Maryann ""melt down.""