“Sunday” is the 81st episode of the ABC television series, Desperate Housewives. It is the eleventh episode of the show’s fourth season and aired on April 13 2008. This was the first episode written after the 2007-08 Writers' Strike. The title of this episode comes from the song 'Sunday' from the musical Sunday in the Park With George by Stephen Sondheim.
While everyone gets ready for church, Lynette decides to attend and embrace religion. She, Tom, and the kids go with Bree and Orson, where Bree thinks Lynette is making a fool of herself when asking the minister questions. After church, Bree asks Lynette to attend a different church because she embarrassed her and Orson. Next Sunday, the minister asks where Lynette is because he liked the way she talked back and gave Bree credit for bringing such a nice new person. Bree then goes to the Catholic church where Lynette was and asks her to come back to her church, but Lynette refused. Later, Bree apologizes and Lynette accepts after stating she is into church because she wants to know why she survived both her cancer and the tornado.
Gabby manages to convince a priest to marry her and Carlos after some initial awkwardness but Carlos fails to reveal he is blind, leading Edie, who was told by the nurse of Carlos's situation, to do it. Gabby then tricks Carlos into falling several times for payback while preparing dog food with bad water as a meal. Carlos finally tells her he was afraid she would leave him. Saying she is not shallow and repeating "For better or for worse", Gabby reassures him she does love him and they end up in bed together.
Susan's cousin, Tim comes to town to help her with finances while Mike is in rehab. He says he got fired from his job for sleeping with his boss's 18 year old daughter, even though he checked to make sure it was legal. Just then, Katherine and Dylan show up at Susan's so Katherine can apologize for her rude behavior. Tim recognizes Katherine from 12 years ago (whom he refers to as "Mrs. Davis", her former name) and can't believe how big Dylan got. Dylan says she is about to turn 18 and Susan starts to get nervous that Tim seems interested in her. The misunderstanding goes on until Susan who hears her cousin having sex through the phone and runs out of Mike's rehab facility and is surprised to find the "girl" to be Katherine. Tim then reveals he lost his virginity to her but later witnessed her hitting her ex-husband with a candlestick, causing Susan to be afraid of her neighbor.