It's Halloween season again. Joy calls Earl to the trailer to demand payback. It seems Earl once ruined Dodge and Earl Jr.'s Halloween by sending them out trick-or-treating alone. Actually, Earl ruined Halloween for the whole neighborhood, since they all had to go out looking for the boys. In order to cross #94 off his list, Joy wants Earl to throw a Halloween party.
When Catalina's nephew Oscar arrives in a crate for a "vacation," Earl and Randy are reminded of another item on the list. Their dad got their mom "fixed" after Earl stuck Randy in the washing machine; thus Earl cost Randy a little brother. Darnell suggests the guys check out Big Bros, Little Bros to get Randy a needy boy to take under his wing.
Little Bros, Big Bros really needs volunteers, so they allow Randy to interact with the boys as a test. Earl is relieved when Randy doesn't get accepted to the program, but Randy is devastated. Catalina suggests Oscar - he needs a male role model. When Earl starts talking in his high-pitched lying voice, Randy decides to go for it.
Randy and Earl spy Oscar stealing a tip off a table at the Crab Shack. Randy resolves to take care of it. Nervous, he tells Oscar to return the money and apologize; he'll feel better. Oscar threatens, "Don't tell me what to do," and begins dancing with voodoo puppets as his eyes roll back in his head. Terrified that Oscar is turning into Satan, Randy runs out.
Earl isn't afraid of a kid acting possessed. He goes looking for Oscar, who has made voodoo dolls of Earl and Randy. Earl orders Oscar to return the money, so Oscar blows some dust in Earl's eyes, which Catalina identifies as ground graveyard sparrow bones, meant to blind a person to the dangers ahead. Every time Catalina tries to tell Oscar what to do, he channels her dead grandmother, so she refuses to take him back.
Earl takes Randy and Oscar to the Halloween party at Joy's. Joy tells Oscar it's not goody bag time. His eyes roll back in his head, and he starts getting scary. Having once been cursed by her babysitter, Joy knows voodoo when she sees it. When Oscar rips out a chunk of her hair, she orders Earl to take him away. And Earl can forget about crossing the boys off his list, since Freaky Voodoo Kid ruined the party.
Back at the motel, Earl is mad. Not only is Oscar messing with people's heads, but now he's messing with karma, since Earl won't be able to cross the boys off his list. Karma is real, but there's no proof that voodoo can do anything - it's just the power of suggestion.
Just as Oscar tries to make the brothers kiss using his voodoo dolls, Darnell runs up with a warning. Joy is on her way with a posse, so the guys run for the trailer. Prepared for just such an emergency, Darnell gives Earl and Randy passports, and meets the mob to plead for mercy. Joy hits Darnell in the head with a rock. Resolved to protect his little brother Oscar, Randy dive bombs the mob.
Earl tries to lend his support, but gets knocked down by a flying jack-o-lantern. Since Randy is finally feeling like a big brother, Earl figures he can cross him off his list, and let karma do its job and save them all. The mob enters the trailer to find Oscar and his voodoo dolls at a Halloween party of their own. Oscar just wants everyone to be happy.
Everyone starts having fun at the party, and Earl is relieved to be able to cross Dodge and Earl Jr. off his list. Oscar maintains that he saved the party with voodoo, but Earl argues that karma is what worked. Finally, Earl realizes that it doesn't matter; whatever works, works, and there's no use arguing. Case in point: the minister thinks Joy should run for mayor.