Now You Know

Now You Know is the first episode of the fourth season of Desperate Housewives and the seventy-first episode of the series overall.

Starring

 * Teri Hatcher as Susan Delfino
 * Felicity Huffman as Lynette Scavo
 * Marcia Cross as Bree Hodge
 * Eva Longoria Parker as Gabrielle Lang
 * Nicollette Sheridan as Edie Britt
 * Ricardo Antonio Chavira as Carlos Solis
 * Andrea Bowen as Julie Mayer
 * Doug Savant as Tom Scavo
 * Kyle MacLachlan as Orson Hodge
 * Dana Delany as Katherine Mayfair
 * with Brenda Strong as Mary Alice Young
 * and James Denton as Mike Delfino

Also Starring

 * Shawn Pyfrom as Andrew Van de Kamp
 * Lyndsy Fonseca as Dylan Mayfair
 * Brent Kinsman as Preston Scavo
 * Shane Kinsman as Porter Scavo
 * Zane Huett as Parker Scavo

Guest Starring

 * Nathan Fillion as Adam Mayfair
 * Kathryn Joosten as Karen McCluskey
 * Julia Campbell as Muriel
 * with Polly Bergen as Stella Wingfield
 * and John Slattery as Victor Lang

Co-Starring

 * Pat Crawford Brown as Ida Greenberg
 * Darian Pinkerton as Penny Scavo
 * Coley Sohn as Nurse
 * Zachary Gordon as Little Boy
 * Gil Glasgow as Man
 * Pamela Kosh as Mrs. McKeever
 * Jim Klock as Security Guard

Uncredited

 * Kerstin Pinkerton as Penny Scavo

Production Notes

 * Dana Delany (Katherine Mayfair) joins the cast in this episode as a main series regular.
 * Despite being a supporting series regular, Joy Lauren (Danielle Van de Kamp) is not credited in this episode.
 * Rachel Fox (Kayla Scavo) is also a supporting series regular however she only joins the cast in the next episode.