It is raining on Wisteria Lane, six months after Mike was run over. He is now in a coma, with Susan by his side. Bree gets engaged to Orson. Gabrielle and Carlos are getting divorced, but they are briefly reunited when their 8½ months pregnant surrogate Xiao-Mei runs away. While adjusting to having another child around the house, Lynette realizes that the girl's mother, Nora, is more than she can handle.

The divorce between Gabrielle and Carlos reaches new levels of bitterness. Susan is determined to jog Mike's memory, and realizes Edie has been posing as his girlfriend since he woke up. Tom decides that his dream is to open a pizza parlor, and Lynette is not delighted. Bree tries to break up Danielle and her history teacher, who's been having an affair with her. Meanwhile, Mike's phone number is discovered on a dead woman's body.

Susan professes her love for Ian. Gabrielle and Carlos try to rekindle their love. Bree is confronted with Orson's past. In the meantime, Nora and Lynette go to war.

Everyone's lives on Wisteria Lane are forever changed when Carolyn Bigsby holds shoppers hostage at a local supermarket. Meanwhile, Gabrielle and Carlos finish dividing their assets: Gabrielle gets the house, and Carlos gets everything in it. Susan is preparing to go to Paris with Ian.

Tom and Lynette try to make Kayla feel like a part of the family. Alma Hodge decides to pay Orson and Bree a visit. Susan visits Mike in jail to tell him about the lawyer Ian got him. Gabrielle accuses Carlos of trying to sabotage her relationship with Bill. Bree organizes a dinner party to show Susan that Alma is alive.

Gabrielle cannot avoid Zach. Mike's new lawyer suggests he pleads guilty, but Susan doesn't agree with that. Gloria informs Bree that she and Alma believe Bree is the other woman. Instead of going back to work Lynette pretends to be ill so she can help Tom promote the pizzeria at a food fair.

Edie gets an unexpected visit from her son. An unexpected pregnancy causes complications. Victor Lang, a man in his 40s running for mayor of Fairview, introduces himself for Gabrielle. The deceased Rex Van De Kamp narrates.

Susan considers moving from Wisteria Lane to London. Later, an accident causes Ian, Susan, and their car to find themselves stranded in a lake. Tom feels threatened by the interest a new Scavo's Pizzeria employee Rick shows in Lynette. While debating his opponent in the mayoral election, Victor Lang witnesses something disturbing.

Gabrielle and Victor will make an unexpected twist in their relationship and will also face a crisis as a video of them sharing a passionate moment in an elevator was caught on tape and is now being used to blackmail them. Edie gets into a fight with one of the ladies that will ruin their "friendship" while another lady on Wisteria Lane ends up in the hospital.

Susan goes to the therapist and realizes she must choose between Ian and Mike. Travers is having a birthday party which only spells trouble for Mrs. McCluskey, Gabrielle's engagement party is upstaged by an unexpected announcement and the neighborhood is full of gossip about the dead body found on Wisteria Lane.

While Tom tries to save his marriage, Mike and Susan get engaged. However, Susan's happiness is short-lived when she realizes Gabrielle has stolen her cancelled wedding with Ian. Meanwhile, Edie wants Carlos to move in with her, and she's ready to do anything to make it happen.

As Gabrielle prepares for her fairy tale wedding, Bree returns to Fairview with a surprise. Meanwhile, Lynette's mother Stella pays her a visit after finding out Lynette has cancer. Finally, Susan and Mike tie the knot in an unexpected location.

Lynette kicks Tom out of her chemotherapy sessions. Susan is mistaken for a stripper. Bree attempts to steal a prize-winning recipe from Katherine.

Bree informs the housewives of what she overheard in the Mayfair house. Stella makes some special brownies to help Lynette through chemotherapy. Susan throws a charades party for the whole neighborhood.

Bob & Lee's contemporary water sculpture in their front yard prompts the Wisteria Lane neighborhood association into action. Edie finds out about the affair that Carlos is having with Gaby. Also, John Rowland wants to rekindle his romance with Gaby.

This is the show's first Halloween episode. Edie Britt's biggest fear comes true when Carlos walks out on their relationship. Susan finds Mike's father, who was supposedly dead. Danielle goes into labor right in the middle of the Halloween party... and somebody has to deliver the baby.

A tornado comes to Wisteria Lane, forcing residents into basements, cellars and safe rooms, and destroying homes and lives. Meanwhile, Susan ends up at the hospital after falling down the stairs.

In the aftermath of the tornado, the residents of Wisteria Lane try to rebuild their lives. Katherine discovers someone may know her secret while Lynette faces the possibility of her family's fate.

Two weeks after the tornado, with Mike still in rehab, Mrs. Delfino gets a visit from her cousin Tim. Meanwhile, Bree desperately awaits to return to her own house. Gabrielle learns that Carlos' blindness is permanent. Katherine is unable to keep some of her secrets from the women of Wisteria Lane. Finally, a surprise wedding ceremony has its own share of secrets.

Gabrielle struggles with the reality of having a blind husband. Lynette is surprised when Rick Coletti shows up at the Scavo pizzeria. Bree and Katherine join forces to plan the Founders Day Ball. As part of his recovery, Mike asks a few people for forgiveness, and Orson starts sleepwalking.

Susan meets her ex-husband, Karl at a Lamaze class, and finds out that he has remarried and is having another child. Lynette learns who was responsible for starting the fire at Rick's restaurant. Bree wants Orson to turn himself in to the police. Meanwhile, Gabrielle rents a room to a hip artist, Ellie, who has a dark secret. Elsewhere, Dylan continues meeting with her father, Wayne, and Katherine decides to go spy on her.

Adele Delfino, Susan's mother-in-law, arrives for a visit. Carlos and Gabrielle find out their tenant, Elli, has a dark secret. A full scale war erupts between Bree and Edie.

"The Gun Song" is the 86th episode of the ABC television series, Desperate Housewives. It is the sixteenth episode of the show's fourth season, and the first half of the two-hour season finale. It aired on May 18, 2008 in the United States.

Susan and Mike try to name their son. Lynette is arrested for supposedly attacking Kayla, and Tom must do what he can to save his family. Bree is being stalked by Orson, and when she meets with Reverend Green, the reverend tries to hit on her. In the meantime, Gabrielle is still helping the police trying to detain Ellie for dealing drugs. Finally, Katherine is visited by her ex-husband, Wayne.