Desperate Housewives Season 3 Episode 22 What Would We Do Without You? ( Air Date 2007-05-13 ) Genre Mystery, Drama, Comedy category. Overview "While Tom tries to save his marriage, Mike and Susan get engaged. However, Susan's happiness is short-lived when she realizes Gabrielle has stolen her cancelled wedding with Ian. Meanwhile, Edie wants Carlos to move in with her, and she's ready to do anything to make it happen.".