Season 3, Episode 14 Cynthia's Back

First Aired: February 17, 2002

The return of the smart and sassy Cynthia rattles Malcolm, who's astonished by her physical maturation. And so is drooling Reese. Cynthia: Tania Raymonde. Karen: Amy Farrington. Reese: Justin Berfield. Malcolm: Frankie Muniz.