|A young girl sees a clown that no-one else can while she is at a carnival with her parents. Late that night, at home, the girl opens the door and lets her new friend, the clown, into the house.
Sam and Dean are watching as a funeral pyre burns their father's body. Sam asks Dean if John said anything before he died, but Dean says no. A week later and the boys are in Bobby's junkyard, Dean working on the Impala. Sam asks if Dean is okay, and Dean snaps back that he's fine and he wishes people would stop asking. They argue, with Sam wanting revenge and Dean wanting to just get on with his life. Sam reveals that he has managed to hack John's voicemail and has found a saved message. They listen to a woman named Ellen who says that she just wants to help him. The boys wonder why John would have kept the message for four months. Sam traces the number to a location and they go off to investigate. Taking one of Bobby's cars, they pull up outside the Roadhouse, a bar out in the middle of nowhere. Picking the locks, they get inside and start looking around. Suddenly, Dean finds himself with a shotgun pointed at him and Sam ends up with another gun pointing at him. The gun's owners are two women who turn out to be Ellen and her daughter, Jo. They were friends of John's and, as soon as they realized who the boys were, they let them go. Sam and Dean tell them that John is dead. Ash, who has been asleep on the pool table, is woken up and believes he can help track the demon using John's research. He tells them to give him 51 hours.
Ellen shows Sam some newspaper cuttings about a murdered couple whose surviving child blamed a clown who turned invisible. Wanting to do what his father would have expected, Sam drags Dean along on the hunt. They end up at the carnival where the family had been before they were killed. When they get there, they find another couple have been killed again who were at the carnival. Trying to blend in while they search around for any indication of a cursed object, they convince the owner to give them jobs. They notice a little girl pointing at a clown none of them can see, so they follow the family home, fearing they will be the latest victims. Sure enough, the clown turns up and the little girl invites him in. The boys storm into the house and shoot at the clown, which appears to be solid and therefore not a ghost. The family wake up and scream at the boys, who make a quick exit. Sam phones Ellen for advice and she suggests an Rakshasa - a race of ancient Hindu creatures who can make themselves invisible. They feed on human flesh and can only enter a house when they have been invited. They also live on beds of dead insects, so the boys head back to the carnival to look for a bed of bugs. While Sam sneaks into the owners room to investigate, Dean goes to try and find a dagger made of pure brass which can kill the creature. He visits the blind knife thrower, but while there, he discovers that the knife thrower isn't blind at all - he's actually the Rakshasa. Avoiding a few thrown knives, Dean rushes outside to find Sam. Still being chased by the creature, they run into the funhouse where they quickly get separated. Not having a brass dagger, Sam quickly improvises by pulling a brass pipe from a pipe organ. With Dean pinned to the wall and being attacked by the creature, Sam tries to attack it, although the invisibility is causing some problems. He eventually succeeds and the creature is destroyed.
They head back to the Roadhouse and Ash tells them that he hasn't managed to track the demon yet, but a computer program he wrote will enable him to search for the signs of the demon's return. As soon as something happens - his computer system will alert them. They thank Ash and Ellen and they boys go back to Bobby's where Dean continues to work on the Impala. Sam comes over to talk to him, confessing that he's not coping too well with their Dad's death and he believes that Dean isn't coping either. Wordlessly, Sam leaves. Dean stands there for a moment until all the anger and rage and pain starts flowing out of him. Taking a crowbar, he starts smashing the Impala - taking out all of his anger at John on his beloved car.