Grinding the Corn (S04E09)

Title: Corn Grinding Plot: Ruth and Bettina embark on a journey to Mexico, allowing the men of Fisher & Diaz to indulge in some male camaraderie and superhero-themed antics. David and Keith have a heart-to-heart after redefining their 'open' relationship; Claire starts to connect with Jimmy after feeling sidelined by Edie and Anita; Billy returns as a guest art instructor; and Nate struggles with his feelings for Brenda, who seeks solace from her old friends to help cope with her heartache.