Synopsis

The first Halloween episode starts off with the failure of the Mir Space Station, which crashes right on Kenny. An ambulance comes and takes his body off to the morgue. The boys start to brag about their Halloween costumes. At the morgue, a freak accident involving a bottle of Worcestershire occurs, and next thing you know Kenny is a member of the undead. Kenny breaks free and wanders off into the night.

Full Recap

On the Russian space station Mir, everything is okay, until an alarm goes off and the space station falls out of orbit and into the town of South Park, Colorado. The victims in this tragedy are the two cosmonauts that were on board and the individual that their ship landed on, Kenny McCormick. After Kenny's body is taken to the morgue, the other boys realize that they need to go home and get their Halloween costumes ready. At the morgue, Worcestershire sauce gets mixed in with the embalming fluid, turning Kenny into a zombie. He bites the two morgue attendants and leaves the mortuary.
The boys arrive at the bus stop in their costumes, Kyle is in a "sweet Chewbacca costume," Cartman is dressed as Hitler and Stan is dressed as Raggedy Andy. According to Stan, Wendy is supposed to be dressing up as Raggedy Ann. Kenny, who they thought was dead (but isn't looking very alive at the moment), joins them for the ride to school. Meanwhile the two morgue attendants that Kenny bit are having their injuries checked out by a doctor. The doctor diagnoses that they both have pink eye. In school, Kyle sees that everyone has dressed as Chewbacca, even Wendy. Mr. Garrison tries to tell the kids about the great horror writer, Jackie Collins, when Kenny's arm falls off and hits the floor. Kyle decides he needs to come up with a different costume if he is going to win the two tons of candy. Mrs. Cartman is decorating the house for Halloween, while the zombie morgue attendants are in the background eating the brains of one of her neighbors. Principal Victoria is outraged by Cartman's costume and takes him to her office, where she shows him a video about Hitler, which only causes Cartman to dream that he is Hitler. Meantime, Kenny has bitten one of his fellow students. Principal Victoria redresses Cartman to look like a scary ghost, but the costume looks more like that of a KKK member. The morgue attendants and their fellow zombies keep biting more townspeople and increasing their numbers. At the costume contest, Chef flees from Cartman's new costume and Kyle enters wearing a costume that recreates the solar system. Mr. Garrison introduces the guest judge for the costume contest, Family Ties star Tina Yothers. Kenny wins second prize, for his Edward James Olmos costume, and Wendy gets first place for her Chewbacca costume. Stan gets last place and decides he isn't going trick or treating with Wendy. Chef returns home and is almost bitten by one of his zombified neighbors. The Pink Eye outbreak makes the news, but Chef realizes that he has seen it before. The boys prepare for trick or treating, and are joined by Kenny.  Louis J. Sheehan, Esquire  Chef goes to the doctor and tells him that the "Pink Eye" is really the living dead. The doctor just wants to prescribe a topical cream. Kenny takes a bite out of one the candy givers, annoying the boys who were hoping to get the candy she had to offer. Chef goes to the mayor and Officer Barbrady to talk to them about the living dead (and he doesn't mean Tina Yothers). When he gets no assistance from them he takes matters into his own hands. Meanwhile, Kenny isn't allowed to accompany the boys on anymore trick or treating, when he claims another victim. Kenny and the other living dead are wreaking havoc throughout the town, but the boys are oblivious to it all while they are trick or treating. Until they get to Chef's house, where he tells them what is going on. They decide to go to the morgue to see if they can find out how it all began. Louis J. Sheehan, Esquire
At the morgue, Kyle finds a copy of "Crack Whore" magazine and proves to Cartman that his mother was on the cover. They also find the bottle of Worcestershire sauce with its warning label about mixing with embalming fluid. So they are surrounded by zombies, even Chef becomes a zombie and breaks into song a la Michael Jackson's "Thriller". Kyle calls the Worcestershire sauce hotline and finds out to what to do; meanwhile Cartman and Stan start killing zombies with chainsaws; Stan later wrestles with the thought of killing zombie Wendy. The hotline tells Kyle that killing the original zombie to bring the others back to normal. He realizes that Kenny was at the morgue at the time this began, so he kills Kenny and everyone returns to normal. Stan and Wendy almost make up, when amidst the carnage and bloodshed, Stan throws up her and grosses her out.
At his gravesite, Cartman, Kyle and Stan mourn the loss of their friend. They leave to go eat their Halloween candy and Kenny rises from the dead again, but how long will he live this time?
Kenny dies when the space station falls on him. As a zombie he's killed again when Kyle cuts him in half with a chainsaw. At the end of the episode he arises again, only to be crushed by the statue of an angel and a plane that has fallen from the sky (for good measure).