DESPERATE HOUSEWIVES - "Desperate Housewives" concludes the season in fitting fashion with a dramatic two-hour Season Finale, SUNDAY, MAY 18 (9:00-11:00 p.m., ET) on the ABC Television Network. In the second hour, "Free" (10:00-11:00 p.m.), gabyand Ellie get into a little catfight.  (ABC/RON TOM) RICARDO ANTONIO CHAVIRA, JUSTINE BATEMAN, EVA LONGORIA PARKER