Fred's fear of becoming seasick threatens the Mertzes and Ricardos' plans for Ricky's European band tour. To prove that Fred won't get seasick, Ricky takes him down to the ship, which is anchored in the harbor. But Fred turns green and becomes more firm about his not going. Lucy and Ethel test some new, improved seasickness remedies on the Staten Island Ferry. The trial run leads to unexpected complications when Lucy gets seasick.