 Meanwhile , thanks to Kenny , the two men are mistakenly diagnosed to have " pinkeye " , but they turn into zombies and go around biting other people , turning them into zombies . Back home , Chef , who sees the outbreak on TV , tries to warn both the doctor and Mayor McDaniels ( who is having sex with Officer Barbrady ) , but his pleas are ignored . The boys go trick @-@ or @-@ treating ( Kyle now dressed as a vampire ) , not noticing the outbreak , and abandon Kenny , who continues to eat people . They arrive at Chef 's home , and Chef tells them what is really going on before taking them to the morgue to stop the outbreak . After discovering the hotline number on the Worcestershire sauce bottle , the boys and Chef are attacked by the zombies with Chef becoming the next victim and acting like Michael Jackson in parody of Thriller . Stan and Cartman kill the other zombies with chainsaws and Stan hesitates to kill a zombified Wendy . After Kyle discovers he has to kill the original zombie ( after being told complicatedly by the hotline lady ) , he slices Kenny in half , killing him . The spell is broken and all the zombies turn back to normal . Stan makes up with Wendy and they are about to kiss but he ends up puking on her , leaving her disgusted . 
