It's Valentine's Day on Wisteria Lane! Against the backdrop of a crime spree involving the Scavo boys, we meet Lynette's sworn enemy: Karen McCluskey.  Rex finally reveals his secret needs to Bree. Mike and Susan face a major blow--or two--to their relationship. Gabby's situation as both an employee and employer takes a new turn. Meanwhile, our hosts talk chewed up astronaut memorabilia, safe words, and worst-case scenarios.