DESPERATE HOUSEWIVES - "My Two Young Men" - John Barrowman makes his way to Wisteria Lane on ABC's "Desperate Housewives," SUNDAY, MARCH 21 (9:00-10:01 p.m., ET). Angie's ex-boyfriend, Patrick (Barrowman), emerges after her trip to New York. Meanwhile it's game on between Gaby and Susan, as they go to shameless lengths to top each other's kids; Lynette believes there's more to Preston's fiance than she's letting on; Bree invites Sam over for a family dinner; and Katherine comes out of the closet. (ABC/RON TOM) HELENA MATTSSON, MAX CARVER