They shoot TV bad girls, don’t they? That’s certainly what happened to femme fatale Ana-Lucia on ABC’s castaway drama “Lost.” She committed a couple of tiny murders and small-screen karmic retribution — or misogyny, depending on who’s asked — stepped in and snatched her fictional life this spring. Luckily for us, there are a lot more where she came from, with villainous vixens stealing scenes on a network near you. Take Showtime’s marijuana-tinged dramedy “Weeds,” which returns for a second season Monday night. Sure, the show’s heroine Nancy sells the sticky icky, but she’s drawn in such a way that viewers find themselves liking Nancy, even relating to her. Nancy’s sidekick, Celia, is another story. A fabulously flawed Frau, she hates herself and everybody else but shrouds her loathsome core in the designer frocks of uppermiddle-class privilege. Let’s celebrate these characters before the firing squad arrives. - Celia Hodes (Elizabeth Perkins), “Weeds,” Mondays, Showtime. Bad-girl ways: Manipulates, criticizes, gossips and lies. Deceive her, and she could lace your favorite chocolate bar with laxatives. - Isabelle Tyler (Megalyn Echikunwoke), “The 4400,” Sundays, USA Network. Bad-girl ways: Murders, seduces, stalks, manipulates and threatens. If a man tries to leave her, he could pay with his life or others’ lives. - Beverly Barlowe (Debrah Farentino), “Eureka,” Tuesdays, Sci Fi. Bad-girl ways: Murders, deceives, sleeps around and consorts with a shadow organization. Disappoint her and she will kill and replace you. - Cristina Yang (Sandra Oh), “Grey’s Anatomy,” Thursdays, ABC. Bad-girl ways: Sulks, lies, runs from love and helping those she loves. Cristina is not the baddest in this bunch, but she is the baddest at Seattle Grace. - Felicia Tilman (Harriet Sansom Harris), “Desperate Housewives,” Sundays, ABC. Bad-girl ways: Avenges estranged sister’s murder at all costs, even if that cost includes a few fingers.