Susan and Mike squabble over letting Julie go out to a party; Tom is banned from Lynette's chemotherapy sessions; Bree is upset to learn Katherine is a better dessert cook; Edie blackmails Carlos into getting engaged.

A game of charades brings out some of the worst in the attending guests; Bree reveals what she overheard in Katherine's house; Gabrielle is unhappy to learn about Carlos and Edie's engagement.

Katherine and Lynette fight for the vacant position of Association President; Bree's former mother-in-law draws battle lines over Danielle's unborn child.

As Halloween approaches, Edie's biggest fear comes true; Susan discovers Mike's father, who he claimed was dead, is actually alive; Danielle goes into labor during Bob and Lee's Halloween costume party.

Things take an unexpected turn when a large tornado hits Wisteria Lane, forcing the residents to seek shelter; Katherine comes clean about her and Adam's past.

In the aftermath of the tornado, Lynette's learns of her family's fate; An incriminating letter, left by Katherine's late aunt, forces her and Adam to come to terms with a dark secret.

A few skeletons in Kathryn Mayfair's abundant closets are sneaking out, and a surprise wedding ceremony takes place.

Lynette gets a surprise when a person from her past shows up at the pizzeria.

Bree and Katherine decide to become business partners, and Mike discovers the truth about the accident that almost killed him.

Lynette discovers who started the fire at Rick's restaurant; Bree gives Orson an ultimatum to turn himself in; Susan reconnects with Karl; Katherine finds out that Dylan is secretly meeting with her father.

Susan gives birth; Bree and Katherine do some self-defense shooting; Kayla pushes her plan to destroy the Scavo family into full force.

Several residents are faced with deadly threats; Adam is held captive by Wayne; Katherine's secret past is finally revealed, after she and Bree are held hostage.