DESPERATE HOUSEWIVES - "The Ladies Who Lunch" - Maisy Gibbons' (guest star Sharon Lawrence) series of unfortunate events shock the residents of Wisteria Lane, and have unexpected consequences for Bree; Gabrielle faces a crisis of her own when her sewer system goes out and she doesn't have the money to fix it; and Lynette braves a scandal herself when it's rumored that the twins started the school's head lice epidemic. Meanwhile, as Susan sinks into depression over her breakup with Mike, she finds a surprising ally, on "Desperate Housewives," SUNDAY, XXXXXX (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/DANNY FELD) EVA LONGORIA, FELICITY HUFFMAN