As Halloween approaches, Edie's biggest fear comes true when Carlos walks out on their relationship. Meanwhile, Susan discovers that Mike's father, Nick Delfino, whom Mike claimed was dead, is alive and serving a life prison term. Lynette, cranky through more chemotherapy, tries to deal with a opossum which digs up her front lawn garden. Gabrielle has an uncomfortable meeting with Victor's father, Milton, who tries to bribe her to stay married to Victor for his own political ambitions. Bob and Lee throw a Halloween costume party at their house and invite the whole neighborhood. Despite Bree's attempts to keep the very pregnant Danielle in seclusion, she crashes the party dressed as the pregnant Bree, and fools literally everyone ('sans' Bree, Orson and Andrew). But things take a turn when Danielle goes into labor right in the middle of the party... and somebody has to deliver the baby. Bree recruit es Adam for the delivery and confides in him with their secret. Afterwards, Danielle agrees to leave town for good while Bree pretends to go into labor herself and give birth to the baby boy herself.
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.
- Susan Mayer is shocked when her husband Mike reveals that his father is still alive (when he had previously told her he was dead) and in prison for murder. Pregnant Susan is floored, but she wants to meet him. Besides, they need to gather genetic data for the sake of their unborn child. Meeting with Mikes father, Nick, to get information on possible hereditary diseases, he tells Susan that he killed his boss, who had gotten the job he had wanted after spreading lies about him. Susan is appalled that Nick does not seem to feel any remorse. Mike stands behind his father telling Susan he was a good person who did a bad thing. When she does not let it go, he says this is why he wanted her to think his father was dead. Susan goes back to see Nick one-to-one and tells him she is afraid of carrying a baby with his genes if he has no conscience. He says the only thing he regrets is making Mike the son of a murderer and advises Susan to keep an eye on him.
Tom Scavo wants to take his wife Lynette out to celebrate her advanced recovery from cancer but all she can focus on is getting rid of a possum that is digging up their yard. When none of the used traps or poison work, Lynette asks to borrow her friend Bree Hodges gun to kill the gatecrasher. Tom is disturbed at how obsessed his wife has become and tries to talk her off taking down the animal. Lynette makes clear that she associates the possum with her cancer as something that disturbs the harmony of her beloved family and she continues her hunt. The next day she learns that she is free from cancer. Breathing a sigh of relief, Lynette walks into her yard to enjoy the calm night being free from fearing for her life. Suddenly she sees the possum lying dead by the fence and tearfully apologizes to it.
The homosexual couple Bob Hunter and Lee McDermott is hosting a Halloween party and decides to invite Bree first, since she has a gay son and is more likely to accept. They catch a glimpse of Brees pregnant daughter Danielle Van De Kamp, who everybody thinks is in Switzerland and not pregnant, looking out a bedroom window and Bree lies quickly saying that it is just her son Andrew, trying out his costume as Cher. She forbids Danielle from attending the party which leads to an argument between mother and daughter which results in Bree telling Danielle she would know the girl would finally be growing up the day she sees a glimmer of herself in her. At the party, Danielle suddenly arrives, dressed up as Bree. She explains to be only following her mothers wishes to be more like her. Bree wants her to go home, but it is too late as Danielles water just broke onto the carpet. Andrew, Bree and her husband Orson rush Danielle to their house. Bree gets Adam Mayfair who is a doctor and swears him to secrecy about what he was going to see; he admits to already know she has been faking a pregnancy to impersonate Danielles baby as hers. The Scavo children Parker, Preston, Porter and Kayla accidentally witness Danielle giving birth to the baby boy in the kitchen and run away screaming. After the infant is delivered, Bree brings it to Danielle who admits having the boy raised by Bree would be best for everyone, though it was harder to give him up than she thought.
Edie Britt catches her fiancé Carlos Solis moving out and tells him she just wants him to tell her if there was someone else he wants to be with or rather why he was leaving her. He lies telling her there is nobody else and she smiles thanking him for making this all easier on her. She marches straight to the Internal Revenue Service to peach on him having an illegal bank account worth 10 million US-dollars. Meanwhile, Carlos ex-wife and secret affair Gabrielle Lang leaves her husband Victor (who plans to run for president), but has to do it by voicemail. She comes home to find Victors father, Milton, waiting for her and telling her how damaging a divorce on the eve of Victors running for governor would be. He offers her a substantial cheque, dated for next year, meaning she would have to stay married to Victor for the next 13 months to get it.
Edies revenge scheme falls apart when the Internal Revenue Service agent tells her that the offshore account numbers she gave him do not exist. She confronts Carlos over moving the money and he denies ever having the stash in the first place. Edie warns him that he was going to pay for what he has done to him. Gabrielle summons Carlos and shows him the cheque, suggesting they extend their original six-month separation to 13 months. She tells him they need it since he is not working right now, so he tells her about the 10 million dollars. She realizes that he had the money when they were married and during the divorce. She says if she cannot trust him she cannot be with him. Gabrielle plans to go off by herself to think things over but finds Victor waiting for her. He vows to make time for her and starts ripping pages out of his appointment book providing not to run for president. his son being president was his fathers dream, but shes his. Edie meets with Victor and shows him the photos of Gabrielle and Carlos kissing that her privat investigator took.