Episode 73 of "Malcolm in the Middle"
s04e10 If Boys Were Girls
Title: If Boys Were Girls
Original Air Date: 02/09/2003 on Fox
Director: Ken Kwapis
Writer: Nahnatchka Khan
Guest Stars: Dona Hardy (Old Lady), Mimi Paley (Renee), Jennette McCurdy (Daisy Wilkerson / Female Dewey), Howard George (Frank), Toran Caudell), Jeff Rosenthal), Jeff Rosenthal (Harry), Michelle Anne Johnson (Saleslady), Stephanie Venditto), Stephanie Venditto (Mrs. Tracy), Lisa Foiles (Mallory), Scott Dreier (Salesman)
Plot Outline:
After being rattled by a battle among the boys, a pregnant Lois ponders the consequences of raising another brawling kid. So she fantasizes that her unruly sons have morphed into well-behaved young daughters. Malcolm becomes Mallory, Reese is transformed into Renee and Dewey turns into Daisy.