DESPERATE HOUSEWIVES - "Remember" - A series of flashbacks take us back to moving-in day on Wisteria Lane for Bree, Susan, Gaby and Lynette, and to how Mary Alice Young brought them all together. Meanwhile Bree gets some frightening news, Susan moves into a trailer, Lynette discovers Tom's secret and all is not well in the house of Solis, on the two-hour Second-Season finale of "Desperate Housewives," SUNDAY, MAY 21 (9:00-11:00 p.m., ET) on the ABC Television Network. (ABC/RON TOM) DOUG SAVANT, TERI HATCHER