|Dean and Sam go to Elwood, Indiana to investigate the disappearances of four people. Due to reports of crop circles and bright lights in the sky, rumors have spread that the disappearances are the work of aliens. Dean and Sam go to visit a watchmaker, Mr. Brennan, who is the father of the first abductee, Patrick Brennan. He acts strange, so Sam stays in the city to watch him while Dean goes out to the cornfield that Patrick disappeared from.
While in the field, Dean gets a call from Sam. Sam tells him that he hasn't seen Mr. Brennan do anything suspicious just as Dean sees a bright light in the sky. Dean, still on the phone, starts running through the corn and screaming about UFOs and close encounters, but he is unable to escape and disappears in a flash of light. Sam goes to investigate the scene of Patrick, and now Dean's, disappearance and finds only Dean's cell phone on the ground. His next stop is the UFO follower camp--a collective of RVs and trailers covered in alien paraphernalia that has Wayne Whittaker, a famous UFO chaser, at its center. Sam goes up to Wayne and asks him how to hunt the aliens, but is disgusted when all Wayne can give him are pages and pages of useless interviews with people who have had close encounters. He tells Wayne that he sucks at hunting UFOs and leaves with a young woman, Sparrow Jennings, who seems interested in him and the story of his brother's disappearance.
Hours later, Dean reappears in the field in a flash of light, knife and gun brandished. He heads back to their motel and finds Sam and Sparrow in bed together. Dean thinks he's only been gone an hour and is upset that Sam was having sex instead of out looking for him, but Sam tells him that it's 4am and that Dean has been gone all night. After his abduction, they seem convinced that aliens are at the center of Elwood's disappearances. Sam researches them at the library while Dean stays at the motel and checks sources online. Dean's alone when the door to the motel bursts open and a "little, glowing, hot, naked lady" flies in and starts hitting him. He traps her in the microwave and cooks her, but when he tries to show Sam her remains, Sam can't see them. Sam puts together the clues and determines that all of the recent UFO encounters were actually the cause of fairies.
Dean and Sam go to visit Marion, a woman they interviewed earlier who had said that fairies were behind the disappearances. She tells them all about fairies, including that they like cream and that they must count every grain of salt or sugar that is spilled in front of them. After they leave, they see Mr. Brennan loading boxes of cream into his car. Dean breaks into his shop and sees elves working on watches for him. He tells Sam, who confronts Mr. Brennan and learns that the man summoned a leprechaunand tried to make a deal with him to save his watchmaking business. Unfortunately, the consequences were the kidnapping of his and then other firstborn sons in the city. Sam resolves to help Mr. Brennan reverse the ritual he used to summon the leprechaun.
Meanwhile, Dean is being stalked by a fairy, a Red Cap in particular, and he mistakenly tackles a midget and is arrested for a hate crime. He is in jail when Sam and Mr. Brennan go to the shop to get what they need to banish the fairies. Mr. Brennan starts to read the ritual, but is killed by Wayne Whittaker, who is actually the leprechaun that Mr. Brennan made his deal with. The leprechaun then tries to make a deal with Sam to give him his soul back, but Sam refuses. They fight until Sam spills salt in front of him, and he is forced to start counting the grains. Sam then reads the ritual and all of the fairies are banished back to their realm. Dean, who was being beaten by the Red Cap in his jail cell, is saved in time and is released from jail the next morning. The midget, who was also the district attorney for Tipton county, dropped the charges against him.